// update the SubCat list with the CatID from the selected Category
    function SelectProduct() {
        var ProductID = ddlProduct.getValue();

        ob_post.AddParam("ProductID", ProductID);
        ob_post.UpdatePanel("callbackPanelVoltage");

        SelectVoltage('0');
        //alert('123');

    }
    function chkHeadingAddValidation() {
        var SubCategoryID = ddlSubCategory.getValue();
        //alert(HeadingID);
        if (SubCategoryID != "") {
            ValidatorEnable(document.getElementById("RequiredFieldValidator2"), false);
        }
        else {
            //ValidatorEnable(document.getElementById("RequiredFieldValidator2"), true);
        }
    }


    function SelectVoltage(id) {
        //chkHeadingAddValidation();
        var VoltageID;
        if (id == "") {
            VoltageID = ddlVoltage.getValue();
        }
        else {
            VoltageID = id;
        }

        var ProductID = ddlProduct.getValue();

        //        alert(ProductID);
        //        alert(VoltageID);
        ob_post.AddParam("ProductID", ProductID);
        ob_post.AddParam("VoltageID", VoltageID);

        ob_post.UpdatePanel("callbackPanelCurrentt");
    }