function product_hover(act, elm)
	{
		
		if(act == 'over')
			{
				var plate = $(elm);
				var overlay = $(elm).down('.overlay');
				
				overlay.update();
				overlay.style.height=plate.getHeight()+'px';
				new Effect.Opacity(overlay, { from: 0, to: 0.4, duration: 0.1 });
				overlay.style.display='block';
			}
		else
			{
				var plate = $(elm).up('div');
				var overlay = $(elm);
				new Effect.Opacity(overlay, { to: 0, duration: 0.5 });
				
			}
	}
	
Event.observe(window, 'load',function()
	  {
		  $(document.body).select('.prod_plate a.overlay').each(function(a)
				{
					new Effect.Opacity(a, { to: 0, duration: 0 });
				})
	  })