Index: jquery/src/event.js
===================================================================
--- jquery/src/event.js	(revision 5762)
+++ jquery/src/event.js	(working copy)
@@ -363,58 +363,40 @@
 			setup: function() {
 				// Make sure the ready event is setup
 				bindReady();
-				return;
 			},
 
-			teardown: function() { return; }
-		},
+			teardown: function() { }
+		}
+	}
+};
 
-		mouseenter: {
-			setup: function() {
-				if ( jQuery.browser.msie ) return false;
-				jQuery(this).bind("mouseover", jQuery.event.special.mouseenter.handler);
-				return true;
-			},
-
-			teardown: function() {
-				if ( jQuery.browser.msie ) return false;
-				jQuery(this).unbind("mouseover", jQuery.event.special.mouseenter.handler);
-				return true;
-			},
-
-			handler: function(event) {
-				// If we actually just moused on to a sub-element, ignore it
-				if ( withinElement(event, this) ) return true;
-				// Execute the right handlers by setting the event type to mouseenter
-				event.type = "mouseenter";
-				return jQuery.event.handle.apply(this, arguments);
+if( !jQuery.browser.msie )
+	jQuery.each({
+		mouseover : 'mouseenter',
+		mouseout  : 'mouseleave' 
+	}, function( orig, fix ){		
+		var event = jQuery.event;
+		
+		function handler( e ) {
+			// If we didn't actually moused on to a sub-element
+			if ( !withinElement(e, this) ){
+				// Fix the event type and execute the right handlers
+				e.type = "mouseenter";
+				return event.handle.apply( this, arguments );
 			}
-		},
-
-		mouseleave: {
+		}
+		
+		event.special[ fix ] = {
 			setup: function() {
-				if ( jQuery.browser.msie ) return false;
-				jQuery(this).bind("mouseout", jQuery.event.special.mouseleave.handler);
-				return true;
+				event.add( this, orig, handler );
 			},
 
 			teardown: function() {
-				if ( jQuery.browser.msie ) return false;
-				jQuery(this).unbind("mouseout", jQuery.event.special.mouseleave.handler);
-				return true;
-			},
+				event.remove( this, orig, handler );
+			}			
+		};
+	});
 
-			handler: function(event) {
-				// If we actually just moused on to a sub-element, ignore it
-				if ( withinElement(event, this) ) return true;
-				// Execute the right handlers by setting the event type to mouseleave
-				event.type = "mouseleave";
-				return jQuery.event.handle.apply(this, arguments);
-			}
-		}
-	}
-};
-
 jQuery.fn.extend({
 	bind: function( type, data, fn ) {
 		return type == "unload" ? this.one(type, data, fn) : this.each(function(){