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diff --git a/plugins/grum_plugins_classes-2/genericjs.js b/plugins/grum_plugins_classes-2/genericjs.js
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+++ b/plugins/grum_plugins_classes-2/genericjs.js
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+/* -----------------------------------------------------------------------------
+  file: genricjs.js
+  file version: 1.0
+  date: 2008-01-02
+  ------------------------------------------------------------------------------
+  author: grum at grum.dnsalias.com
+  << May the Little SpaceFrog be with you >>
+  ------------------------------------------------------------------------------
+
+  this classes provides base functions to make easiest a compliant code with
+  FF2.0 & IE7.0
+  
+
+  ------------------------------------------------------------------------------
+  HISTORY VERSION
+              
+   -------------------------------------------------------------------------- */
+
+
+
+/*
+  this is an implementation of the function <indexOf> to the Array class, as
+  defined in the ECMA-262 standard
+  for more information, see at http://developer.mozilla.org/fr/docs/R%C3%A9f%C3%A9rence_de_JavaScript_1.5_Core:Objets_globaux:Array:indexOf
+
+  not implemented in IE 7.0
+*/
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(elt /*, from*/)
+  {
+    var len = this.length;
+
+    var from = Number(arguments[1]) || 0;
+    from = (from < 0)
+         ? Math.ceil(from)
+         : Math.floor(from);
+    if (from < 0)
+      from += len;
+
+    for (; from < len; from++)
+    {
+      if (from in this &&
+          this[from] === elt)
+        return from;
+    }
+    return -1;
+  };
+}