//async update presistent cart
function updatePresCart()
{
    div = getId("presCart")
    div.style.background = "#f3e7c9"
    
    url = "/shop/presCart/?";      
   
    var d = new Date();  
    url = url + "&t=" + d.getTime();   
    getDataAsync(url, "presCart", 'getId(div).style.background = "#FFFFFF";');         
    
}