loader function

function validateForm(valgroup) {
            try {
                $(".errormsg").show();
                if (Page_ClientValidate(valgroup)) {
                }
                else {}
               
            }
            catch (e) {
                alert(e);
            }
        }

<asp:Button ID="btnSubmit" runat="server" CssClass="submit" OnClick="imgBtnSubmit_Click"
                            ValidationGroup="SUBMIT" Text="Submit" OnClientClick="validateForm('SUBMIT')" />