1 files changed, 396 insertions, 131 deletions

diff --git a/themes/default/js/ui/jquery.ui.position.js b/themes/default/js/ui/jquery.ui.position.js
index 3db2b53b3..3184a53eb 100644
--- a/themes/default/js/ui/jquery.ui.position.js
+++ b/themes/default/js/ui/jquery.ui.position.js
@@ -1,21 +1,87 @@
-/*
- * jQuery UI Position 1.8.16
+/*!
+ * jQuery UI Position 1.9.0
+ * http://jqueryui.com
  *
- * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
- * Dual licensed under the MIT or GPL Version 2 licenses.
+ * Copyright 2012 jQuery Foundation and other contributors
+ * Released under the MIT license.
  * http://jquery.org/license
  *
- * http://docs.jquery.com/UI/Position
+ * http://api.jqueryui.com/position/
  */
 (function( $, undefined ) {
 
 $.ui = $.ui || {};
 
-var horizontalPositions = /left|center|right/,
-	verticalPositions = /top|center|bottom/,
-	center = "center",
-	_position = $.fn.position,
-	_offset = $.fn.offset;
+var cachedScrollbarWidth,
+	max = Math.max,
+	abs = Math.abs,
+	round = Math.round,
+	rhorizontal = /left|center|right/,
+	rvertical = /top|center|bottom/,
+	roffset = /[\+\-]\d+%?/,
+	rposition = /^\w+/,
+	rpercent = /%$/,
+	_position = $.fn.position;
+
+function getOffsets( offsets, width, height ) {
+	return [
+		parseInt( offsets[ 0 ], 10 ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
+		parseInt( offsets[ 1 ], 10 ) * ( rpercent.test( offsets[ 1 ] ) ? height / 100 : 1 )
+	];
+}
+function parseCss( element, property ) {
+	return parseInt( $.css( element, property ), 10 ) || 0;
+}
+
+$.position = {
+	scrollbarWidth: function() {
+		if ( cachedScrollbarWidth !== undefined ) {
+			return cachedScrollbarWidth;
+		}
+		var w1, w2,
+			div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
+			innerDiv = div.children()[0];
+
+		$( "body" ).append( div );
+		w1 = innerDiv.offsetWidth;
+		div.css( "overflow", "scroll" );
+
+		w2 = innerDiv.offsetWidth;
+
+		if ( w1 === w2 ) {
+			w2 = div[0].clientWidth;
+		}
+
+		div.remove();
+
+		return (cachedScrollbarWidth = w1 - w2);
+	},
+	getScrollInfo: function( within ) {
+		var overflowX = within.isWindow ? "" : within.element.css( "overflow-x" ),
+			overflowY = within.isWindow ? "" : within.element.css( "overflow-y" ),
+			hasOverflowX = overflowX === "scroll" ||
+				( overflowX === "auto" && within.width < within.element[0].scrollWidth ),
+			hasOverflowY = overflowY === "scroll" ||
+				( overflowY === "auto" && within.height < within.element[0].scrollHeight );
+		return {
+			width: hasOverflowX ? $.position.scrollbarWidth() : 0,
+			height: hasOverflowY ? $.position.scrollbarWidth() : 0
+		};
+	},
+	getWithinInfo: function( element ) {
+		var withinElement = $( element || window ),
+			isWindow = $.isWindow( withinElement[0] );
+		return {
+			element: withinElement,
+			isWindow: isWindow,
+			offset: withinElement.offset() || { left: 0, top: 0 },
+			scrollLeft: withinElement.scrollLeft(),
+			scrollTop: withinElement.scrollTop(),
+			width: isWindow ? withinElement.width() : withinElement.outerWidth(),
+			height: isWindow ? withinElement.height() : withinElement.outerHeight()
+		};
+	}
+};
 
 $.fn.position = function( options ) {
 	if ( !options || !options.of ) {
@@ -25,48 +91,65 @@ $.fn.position = function( options ) {
 	// make a copy, we don't want to modify arguments
 	options = $.extend( {}, options );
 
-	var target = $( options.of ),
+	var atOffset, targetWidth, targetHeight, targetOffset, basePosition,
+		target = $( options.of ),
+		within = $.position.getWithinInfo( options.within ),
+		scrollInfo = $.position.getScrollInfo( within ),
 		targetElem = target[0],
 		collision = ( options.collision || "flip" ).split( " " ),
-		offset = options.offset ? options.offset.split( " " ) : [ 0, 0 ],
-		targetWidth,
-		targetHeight,
-		basePosition;
+		offsets = {};
 
 	if ( targetElem.nodeType === 9 ) {
 		targetWidth = target.width();
 		targetHeight = target.height();
-		basePosition = { top: 0, left: 0 };
-	// TODO: use $.isWindow() in 1.9
-	} else if ( targetElem.setTimeout ) {
+		targetOffset = { top: 0, left: 0 };
+	} else if ( $.isWindow( targetElem ) ) {
 		targetWidth = target.width();
 		targetHeight = target.height();
-		basePosition = { top: target.scrollTop(), left: target.scrollLeft() };
+		targetOffset = { top: target.scrollTop(), left: target.scrollLeft() };
 	} else if ( targetElem.preventDefault ) {
 		// force left top to allow flipping
 		options.at = "left top";
 		targetWidth = targetHeight = 0;
-		basePosition = { top: options.of.pageY, left: options.of.pageX };
+		targetOffset = { top: targetElem.pageY, left: targetElem.pageX };
 	} else {
 		targetWidth = target.outerWidth();
 		targetHeight = target.outerHeight();
-		basePosition = target.offset();
+		targetOffset = target.offset();
 	}
+	// clone to reuse original targetOffset later
+	basePosition = $.extend( {}, targetOffset );
 
-	// force my and at to have valid horizontal and veritcal positions
-	// if a value is missing or invalid, it will be converted to center 
+	// force my and at to have valid horizontal and vertical positions
+	// if a value is missing or invalid, it will be converted to center
 	$.each( [ "my", "at" ], function() {
-		var pos = ( options[this] || "" ).split( " " );
+		var pos = ( options[ this ] || "" ).split( " " ),
+			horizontalOffset,
+			verticalOffset;
+
 		if ( pos.length === 1) {
-			pos = horizontalPositions.test( pos[0] ) ?
-				pos.concat( [center] ) :
-				verticalPositions.test( pos[0] ) ?
-					[ center ].concat( pos ) :
-					[ center, center ];
+			pos = rhorizontal.test( pos[ 0 ] ) ?
+				pos.concat( [ "center" ] ) :
+				rvertical.test( pos[ 0 ] ) ?
+					[ "center" ].concat( pos ) :
+					[ "center", "center" ];
 		}
-		pos[ 0 ] = horizontalPositions.test( pos[0] ) ? pos[ 0 ] : center;
-		pos[ 1 ] = verticalPositions.test( pos[1] ) ? pos[ 1 ] : center;
-		options[ this ] = pos;
+		pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : "center";
+		pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : "center";
+
+		// calculate offsets
+		horizontalOffset = roffset.exec( pos[ 0 ] );
+		verticalOffset = roffset.exec( pos[ 1 ] );
+		offsets[ this ] = [
+			horizontalOffset ? horizontalOffset[ 0 ] : 0,
+			verticalOffset ? verticalOffset[ 0 ] : 0
+		];
+
+		// reduce to just the positions without the offsets
+		options[ this ] = [
+			rposition.exec( pos[ 0 ] )[ 0 ],
+			rposition.exec( pos[ 1 ] )[ 0 ]
+		];
 	});
 
 	// normalize collision option
@@ -74,65 +157,63 @@ $.fn.position = function( options ) {
 		collision[ 1 ] = collision[ 0 ];
 	}
 
-	// normalize offset option
-	offset[ 0 ] = parseInt( offset[0], 10 ) || 0;
-	if ( offset.length === 1 ) {
-		offset[ 1 ] = offset[ 0 ];
-	}
-	offset[ 1 ] = parseInt( offset[1], 10 ) || 0;
-
-	if ( options.at[0] === "right" ) {
+	if ( options.at[ 0 ] === "right" ) {
 		basePosition.left += targetWidth;
-	} else if ( options.at[0] === center ) {
+	} else if ( options.at[ 0 ] === "center" ) {
 		basePosition.left += targetWidth / 2;
 	}
 
-	if ( options.at[1] === "bottom" ) {
+	if ( options.at[ 1 ] === "bottom" ) {
 		basePosition.top += targetHeight;
-	} else if ( options.at[1] === center ) {
+	} else if ( options.at[ 1 ] === "center" ) {
 		basePosition.top += targetHeight / 2;
 	}
 
-	basePosition.left += offset[ 0 ];
-	basePosition.top += offset[ 1 ];
+	atOffset = getOffsets( offsets.at, targetWidth, targetHeight );
+	basePosition.left += atOffset[ 0 ];
+	basePosition.top += atOffset[ 1 ];
 
 	return this.each(function() {
-		var elem = $( this ),
+		var collisionPosition, using,
+			elem = $( this ),
 			elemWidth = elem.outerWidth(),
 			elemHeight = elem.outerHeight(),
-			marginLeft = parseInt( $.curCSS( this, "marginLeft", true ) ) || 0,
-			marginTop = parseInt( $.curCSS( this, "marginTop", true ) ) || 0,
-			collisionWidth = elemWidth + marginLeft +
-				( parseInt( $.curCSS( this, "marginRight", true ) ) || 0 ),
-			collisionHeight = elemHeight + marginTop +
-				( parseInt( $.curCSS( this, "marginBottom", true ) ) || 0 ),
+			marginLeft = parseCss( this, "marginLeft" ),
+			marginTop = parseCss( this, "marginTop" ),
+			collisionWidth = elemWidth + marginLeft + parseCss( this, "marginRight" ) + scrollInfo.width,
+			collisionHeight = elemHeight + marginTop + parseCss( this, "marginBottom" ) + scrollInfo.height,
 			position = $.extend( {}, basePosition ),
-			collisionPosition;
+			myOffset = getOffsets( offsets.my, elem.outerWidth(), elem.outerHeight() );
 
-		if ( options.my[0] === "right" ) {
+		if ( options.my[ 0 ] === "right" ) {
 			position.left -= elemWidth;
-		} else if ( options.my[0] === center ) {
+		} else if ( options.my[ 0 ] === "center" ) {
 			position.left -= elemWidth / 2;
 		}
 
-		if ( options.my[1] === "bottom" ) {
+		if ( options.my[ 1 ] === "bottom" ) {
 			position.top -= elemHeight;
-		} else if ( options.my[1] === center ) {
+		} else if ( options.my[ 1 ] === "center" ) {
 			position.top -= elemHeight / 2;
 		}
 
-		// prevent fractions (see #5280)
-		position.left = Math.round( position.left );
-		position.top = Math.round( position.top );
+		position.left += myOffset[ 0 ];
+		position.top += myOffset[ 1 ];
+
+		// if the browser doesn't support fractions, then round for consistent results
+		if ( !$.support.offsetFractions ) {
+			position.left = round( position.left );
+			position.top = round( position.top );
+		}
 
 		collisionPosition = {
-			left: position.left - marginLeft,
-			top: position.top - marginTop
+			marginLeft: marginLeft,
+			marginTop: marginTop
 		};
 
 		$.each( [ "left", "top" ], function( i, dir ) {
-			if ( $.ui.position[ collision[i] ] ) {
-				$.ui.position[ collision[i] ][ dir ]( position, {
+			if ( $.ui.position[ collision[ i ] ] ) {
+				$.ui.position[ collision[ i ] ][ dir ]( position, {
 					targetWidth: targetWidth,
 					targetHeight: targetHeight,
 					elemWidth: elemWidth,
@@ -140,9 +221,11 @@ $.fn.position = function( options ) {
 					collisionPosition: collisionPosition,
 					collisionWidth: collisionWidth,
 					collisionHeight: collisionHeight,
-					offset: offset,
+					offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
 					my: options.my,
-					at: options.at
+					at: options.at,
+					within: within,
+					elem : elem
 				});
 			}
 		});
@@ -150,31 +233,137 @@ $.fn.position = function( options ) {
 		if ( $.fn.bgiframe ) {
 			elem.bgiframe();
 		}
-		elem.offset( $.extend( position, { using: options.using } ) );
+
+		if ( options.using ) {
+			// adds feedback as second argument to using callback, if present
+			using = function( props ) {
+				var left = targetOffset.left - position.left,
+					right = left + targetWidth - elemWidth,
+					top = targetOffset.top - position.top,
+					bottom = top + targetHeight - elemHeight,
+					feedback = {
+						target: {
+							element: target,
+							left: targetOffset.left,
+							top: targetOffset.top,
+							width: targetWidth,
+							height: targetHeight
+						},
+						element: {
+							element: elem,
+							left: position.left,
+							top: position.top,
+							width: elemWidth,
+							height: elemHeight
+						},
+						horizontal: right < 0 ? "left" : left > 0 ? "right" : "center",
+						vertical: bottom < 0 ? "top" : top > 0 ? "bottom" : "middle"
+					};
+				if ( targetWidth < elemWidth && abs( left + right ) < targetWidth ) {
+					feedback.horizontal = "center";
+				}
+				if ( targetHeight < elemHeight && abs( top + bottom ) < targetHeight ) {
+					feedback.vertical = "middle";
+				}
+				if ( max( abs( left ), abs( right ) ) > max( abs( top ), abs( bottom ) ) ) {
+					feedback.important = "horizontal";
+				} else {
+					feedback.important = "vertical";
+				}
+				options.using.call( this, props, feedback );
+			};
+		}
+
+		elem.offset( $.extend( position, { using: using } ) );
 	});
 };
 
 $.ui.position = {
 	fit: {
 		left: function( position, data ) {
-			var win = $( window ),
-				over = data.collisionPosition.left + data.collisionWidth - win.width() - win.scrollLeft();
-			position.left = over > 0 ? position.left - over : Math.max( position.left - data.collisionPosition.left, position.left );
+			var within = data.within,
+				withinOffset = within.isWindow ? within.scrollLeft : within.offset.left,
+				outerWidth = within.width,
+				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
+				overLeft = withinOffset - collisionPosLeft,
+				overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
+				newOverRight;
+
+			// element is wider than within
+			if ( data.collisionWidth > outerWidth ) {
+				// element is initially over the left side of within
+				if ( overLeft > 0 && overRight <= 0 ) {
+					newOverRight = position.left + overLeft + data.collisionWidth - outerWidth - withinOffset;
+					position.left += overLeft - newOverRight;
+				// element is initially over right side of within
+				} else if ( overRight > 0 && overLeft <= 0 ) {
+					position.left = withinOffset;
+				// element is initially over both left and right sides of within
+				} else {
+					if ( overLeft > overRight ) {
+						position.left = withinOffset + outerWidth - data.collisionWidth;
+					} else {
+						position.left = withinOffset;
+					}
+				}
+			// too far left -> align with left edge
+			} else if ( overLeft > 0 ) {
+				position.left += overLeft;
+			// too far right -> align with right edge
+			} else if ( overRight > 0 ) {
+				position.left -= overRight;
+			// adjust based on position and margin
+			} else {
+				position.left = max( position.left - collisionPosLeft, position.left );
+			}
 		},
 		top: function( position, data ) {
-			var win = $( window ),
-				over = data.collisionPosition.top + data.collisionHeight - win.height() - win.scrollTop();
-			position.top = over > 0 ? position.top - over : Math.max( position.top - data.collisionPosition.top, position.top );
+			var within = data.within,
+				withinOffset = within.isWindow ? within.scrollTop : within.offset.top,
+				outerHeight = data.within.height,
+				collisionPosTop = position.top - data.collisionPosition.marginTop,
+				overTop = withinOffset - collisionPosTop,
+				overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
+				newOverBottom;
+
+			// element is taller than within
+			if ( data.collisionHeight > outerHeight ) {
+				// element is initially over the top of within
+				if ( overTop > 0 && overBottom <= 0 ) {
+					newOverBottom = position.top + overTop + data.collisionHeight - outerHeight - withinOffset;
+					position.top += overTop - newOverBottom;
+				// element is initially over bottom of within
+				} else if ( overBottom > 0 && overTop <= 0 ) {
+					position.top = withinOffset;
+				// element is initially over both top and bottom of within
+				} else {
+					if ( overTop > overBottom ) {
+						position.top = withinOffset + outerHeight - data.collisionHeight;
+					} else {
+						position.top = withinOffset;
+					}
+				}
+			// too far up -> align with top
+			} else if ( overTop > 0 ) {
+				position.top += overTop;
+			// too far down -> align with bottom edge
+			} else if ( overBottom > 0 ) {
+				position.top -= overBottom;
+			// adjust based on position and margin
+			} else {
+				position.top = max( position.top - collisionPosTop, position.top );
+			}
 		}
 	},
-
 	flip: {
 		left: function( position, data ) {
-			if ( data.at[0] === center ) {
-				return;
-			}
-			var win = $( window ),
-				over = data.collisionPosition.left + data.collisionWidth - win.width() - win.scrollLeft(),
+			var within = data.within,
+				withinOffset = within.offset.left + within.scrollLeft,
+				outerWidth = within.width,
+				offsetLeft = within.isWindow ? within.scrollLeft : within.offset.left,
+				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
+				overLeft = collisionPosLeft - offsetLeft,
+				overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
 				myOffset = data.my[ 0 ] === "left" ?
 					-data.elemWidth :
 					data.my[ 0 ] === "right" ?
@@ -182,71 +371,147 @@ $.ui.position = {
 						0,
 				atOffset = data.at[ 0 ] === "left" ?
 					data.targetWidth :
-					-data.targetWidth,
-				offset = -2 * data.offset[ 0 ];
-			position.left += data.collisionPosition.left < 0 ?
-				myOffset + atOffset + offset :
-				over > 0 ?
-					myOffset + atOffset + offset :
-					0;
+					data.at[ 0 ] === "right" ?
+						-data.targetWidth :
+						0,
+				offset = -2 * data.offset[ 0 ],
+				newOverRight,
+				newOverLeft;
+
+			if ( overLeft < 0 ) {
+				newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth - outerWidth - withinOffset;
+				if ( newOverRight < 0 || newOverRight < abs( overLeft ) ) {
+					position.left += myOffset + atOffset + offset;
+				}
+			}
+			else if ( overRight > 0 ) {
+				newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset + atOffset + offset - offsetLeft;
+				if ( newOverLeft > 0 || abs( newOverLeft ) < overRight ) {
+					position.left += myOffset + atOffset + offset;
+				}
+			}
 		},
 		top: function( position, data ) {
-			if ( data.at[1] === center ) {
-				return;
-			}
-			var win = $( window ),
-				over = data.collisionPosition.top + data.collisionHeight - win.height() - win.scrollTop(),
-				myOffset = data.my[ 1 ] === "top" ?
+			var within = data.within,
+				withinOffset = within.offset.top + within.scrollTop,
+				outerHeight = within.height,
+				offsetTop = within.isWindow ? within.scrollTop : within.offset.top,
+				collisionPosTop = position.top - data.collisionPosition.marginTop,
+				overTop = collisionPosTop - offsetTop,
+				overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
+				top = data.my[ 1 ] === "top",
+				myOffset = top ?
 					-data.elemHeight :
 					data.my[ 1 ] === "bottom" ?
 						data.elemHeight :
 						0,
 				atOffset = data.at[ 1 ] === "top" ?
 					data.targetHeight :
-					-data.targetHeight,
-				offset = -2 * data.offset[ 1 ];
-			position.top += data.collisionPosition.top < 0 ?
-				myOffset + atOffset + offset :
-				over > 0 ?
-					myOffset + atOffset + offset :
-					0;
+					data.at[ 1 ] === "bottom" ?
+						-data.targetHeight :
+						0,
+				offset = -2 * data.offset[ 1 ],
+				newOverTop,
+				newOverBottom;
+			if ( overTop < 0 ) {
+				newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight - outerHeight - withinOffset;
+				if ( ( position.top + myOffset + atOffset + offset) > overTop && ( newOverBottom < 0 || newOverBottom < abs( overTop ) ) ) {
+					position.top += myOffset + atOffset + offset;
+				}
+			}
+			else if ( overBottom > 0 ) {
+				newOverTop = position.top -  data.collisionPosition.marginTop + myOffset + atOffset + offset - offsetTop;
+				if ( ( position.top + myOffset + atOffset + offset) > overBottom && ( newOverTop > 0 || abs( newOverTop ) < overBottom ) ) {
+					position.top += myOffset + atOffset + offset;
+				}
+			}
+		}
+	},
+	flipfit: {
+		left: function() {
+			$.ui.position.flip.left.apply( this, arguments );
+			$.ui.position.fit.left.apply( this, arguments );
+		},
+		top: function() {
+			$.ui.position.flip.top.apply( this, arguments );
+			$.ui.position.fit.top.apply( this, arguments );
 		}
 	}
 };
 
-// offset setter from jQuery 1.4
-if ( !$.offset.setOffset ) {
-	$.offset.setOffset = function( elem, options ) {
-		// set position first, in-case top/left are set even on static elem
-		if ( /static/.test( $.curCSS( elem, "position" ) ) ) {
-			elem.style.position = "relative";
-		}
-		var curElem   = $( elem ),
-			curOffset = curElem.offset(),
-			curTop    = parseInt( $.curCSS( elem, "top",  true ), 10 ) || 0,
-			curLeft   = parseInt( $.curCSS( elem, "left", true ), 10)  || 0,
-			props     = {
-				top:  (options.top  - curOffset.top)  + curTop,
-				left: (options.left - curOffset.left) + curLeft
-			};
-		
-		if ( 'using' in options ) {
-			options.using.call( elem, props );
-		} else {
-			curElem.css( props );
-		}
-	};
+// fraction support test
+(function () {
+	var testElement, testElementParent, testElementStyle, offsetLeft, i,
+		body = document.getElementsByTagName( "body" )[ 0 ],
+		div = document.createElement( "div" );
 
-	$.fn.offset = function( options ) {
-		var elem = this[ 0 ];
-		if ( !elem || !elem.ownerDocument ) { return null; }
-		if ( options ) { 
-			return this.each(function() {
-				$.offset.setOffset( this, options );
-			});
-		}
-		return _offset.call( this );
+	//Create a "fake body" for testing based on method used in jQuery.support
+	testElement = document.createElement( body ? "div" : "body" );
+	testElementStyle = {
+		visibility: "hidden",
+		width: 0,
+		height: 0,
+		border: 0,
+		margin: 0,
+		background: "none"
 	};
+	if ( body ) {
+		$.extend( testElementStyle, {
+			position: "absolute",
+			left: "-1000px",
+			top: "-1000px"
+		});
+	}
+	for ( i in testElementStyle ) {
+		testElement.style[ i ] = testElementStyle[ i ];
+	}
+	testElement.appendChild( div );
+	testElementParent = body || document.documentElement;
+	testElementParent.insertBefore( testElement, testElementParent.firstChild );
+
+	div.style.cssText = "position: absolute; left: 10.7432222px;";
+
+	offsetLeft = $( div ).offset().left;
+	$.support.offsetFractions = offsetLeft > 10 && offsetLeft < 11;
+
+	testElement.innerHTML = "";
+	testElementParent.removeChild( testElement );
+})();
+
+// DEPRECATED
+if ( $.uiBackCompat !== false ) {
+	// offset option
+	(function( $ ) {
+		var _position = $.fn.position;
+		$.fn.position = function( options ) {
+			if ( !options || !options.offset ) {
+				return _position.call( this, options );
+			}
+			var offset = options.offset.split( " " ),
+				at = options.at.split( " " );
+			if ( offset.length === 1 ) {
+				offset[ 1 ] = offset[ 0 ];
+			}
+			if ( /^\d/.test( offset[ 0 ] ) ) {
+				offset[ 0 ] = "+" + offset[ 0 ];
+			}
+			if ( /^\d/.test( offset[ 1 ] ) ) {
+				offset[ 1 ] = "+" + offset[ 1 ];
+			}
+			if ( at.length === 1 ) {
+				if ( /left|center|right/.test( at[ 0 ] ) ) {
+					at[ 1 ] = "center";
+				} else {
+					at[ 1 ] = at[ 0 ];
+					at[ 0 ] = "center";
+				}
+			}
+			return _position.call( this, $.extend( options, {
+				at: at[ 0 ] + offset[ 0 ] + " " + at[ 1 ] + offset[ 1 ],
+				offset: undefined
+			} ) );
+		};
+	}( jQuery ) );
 }
 
-}( jQuery ));
+}( jQuery ) );