function thumbnailList(a, div) {
		$$(div).each(function(d) { 
			var c = d.getFirst();
			var b = new Fx.Tween(c,{transition:"expo:out",link:"cancel"});
			
			d.addEvents({mouseenter:function(){b.start("margin-left","-"+a+"px")},mouseleave:function(){b.start("margin-left","0")}})
		})
	}