nel documento, cambia questo
codice:
		<script type="text/javascript">
			
			window.addEvent('domready', function(){
				var myMenu = new ImageMenu($$('#imageMenu a'),{openWidth:310, border:2, onOpen:function(e,i){alert(e);}});
			});
		</script>
in
codice:
		<script type="text/javascript">
			
			window.addEvent('domready', function(){
				var myMenu = new ImageMenu($$('#imageMenu a'),{openWidth:310, border:2, onOpen:false});
			});
		</script>
ciao