function openCatalog(productid)
{
    if (productid != null)
        window.open("../Catalog/Detail.aspx?ProductID=" + productid, "_blank", "toolbar=no,location=yes,scrollbars=1,menubar=yes,status=yes,resizable=yes,width=950");
    else
        window.open("../Catalog/Default.aspx", "_blank", "toolbar=no,location=yes,scrollbars=1,menubar=yes,status=yes,resizable=yes,width=950");
}