var max_product = 100
var arr_product_id = new Array(max_product);
var arr_product_info = new Array(max_product);
for(var i=0;i<max_product;i++) arr_product_id[i] = 0

function getProductInfo(product_id)
{    
    var i;
    for(i=0;i<max_product;i++)
        if (arr_product_id[i]==product_id) return arr_product_info[i]
    if (i==max_product) //neu chua co thong tin
    {
    
        //xac dinh vi tri cuoi cung chua co thong tin
        for(i=0;i<max_product;i++) if (arr_product_id[i]==0) break;
        
        //danh dau vi tri
        arr_product_id[i]=product_id
        arr_product_info[i]=''
        //lay thong tin luu vao mang 
         getInfor(product_id)
    }
    
    return ''
}

function getInfor(product_id)
{   
        //goi ham ajax
        $.ajax({ 
            url:"/AjaxFunctions/GetProductDetails.aspx",
            data: "p="+product_id, 
            
            //thong bao loi
            error: function(XMLHttpRequest, textStatus, errorThrown){ alert(XMLHttpRequest.responseText);
            },
            success: function(return_data){ 
            
               for(i=0;i<max_product;i++) if (arr_product_id[i]==product_id) break;  
                arr_product_info[i]=return_data 
            } 
        })
   

   
}