How to Close ajax model pop using javascript.

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C#

ASP.NET

I have two modelpop in 1 Child page's content place holder. and i have write the java script for close modelpop in Header content placeholder. But it...

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">

    <script type="text/javascript" language="javascript">
        function closePopup() {
            $find('ctl00_ContentPlaceHolder1_ModalPopupExtender1').hide();
            // $find('ContentPlaceHolder1_ModalPopupExtender1').hide();

            //var phn = document.getElementById('ctl00_ContentPlaceHolder1_txtAdmisnNo');
            //document.getElementById('ctl00_ContentPlaceHolder1_txtAdmisnNo').value = "";
            document.getElementById('ContentPlaceHolder1_ModalPopupExtender1').value = "";
        }
        //        function showPopup() {
        //            $find('ctl00_ContentPlaceHolder1_ModalPopupExtender1').hide();
        //        }
        function closePopup1() {
            $find('ctl00_ContentPlaceHolder1_ModalPopupExtender2').hide();
            // $find('ContentPlaceHolder1_ModalPopupExtender1').hide();

            //var phn = document.getElementById('ctl00_ContentPlaceHolder1_txtAdmisnNo');
            //document.getElementById('ctl00_ContentPlaceHolder1_txtAdmisnNo').value = "";
            document.getElementById('ContentPlaceHolder1_ModalPopupExtender2').value = "";
        }
    </script>