document.observe('dom:loaded',function(){
    var products = $('product-list-view').getElementsByClassName('product-list-thumbnail');
    products.each(function(elm, index){
        elm.hide();
        elm.observe('load', function(){
            $(this.id).appear();
        });
         // IE hack - onload wont fire if the src is set before onload (if the image is in the cache)
        if(Prototype.Browser.IE) elm.src = elm.src;
    });
});