Index: jquery/src/core.js
===================================================================
--- jquery/src/core.js	(revision 5961)
+++ jquery/src/core.js	(working copy)
@@ -1150,12 +1150,26 @@
 	inArray: function( elem, array ) {
 		for ( var i = 0, length = array.length; i < length; i++ )
 		// Use === because on IE, window == document
-			if ( array[ i ] === elem )
+  	// added second condition because when comparing two arrays containing identical elements, false is returned
+  		if (( array[ i ] === elem ) || (( array[ i ] instanceof Array ) && jQuery.compareArrays(elem, array[ i ]) ))
 				return i;
 
 		return -1;
 	},
 
+	compareArrays: function( array1, array2 ) {
+    // adapted from code by Patrick Hunlock
+    // http://www.hunlock.com/blogs/Mastering_Javascript_Arrays
+	  if ( array1.length != array2.length ) return false;
+    for ( var i = 0; i < array2.length; i++ ) {
+        if ( array1[i] instanceof Array ) {
+          if ( !jQuery.compareArrays(array1[i], array2[i]) ) return false;
+        }
+        if ( array1[i] !== array2[i] ) return false;
+    }
+    return true;
+	},
+
 	merge: function( first, second ) {
 		// We have to loop this way because IE & Opera overwrite the length
 		// expando of getElementsByTagName