function OpenModelPopup()
    {
        window.open('http://santanu/diffpopup.aspx', 'open_window', 'menubar, toolbar, location, directories, status, scrollbars, dependent, width=640, height=480, left=0, top=0')
        $('.example1demo').popupWindow({ height: 500, width: 800, top: 50, left: 50 });
//        document.getElementById ('ModalPopupDiv').style.visibility='visible';
//        document.getElementById ('ModalPopupDiv').style.display='';
//        document.getElementById ('ModalPopupDiv').style.top= Math.round ((document.documentElement.clientHeight/2)+ document.documentElement.scrollTop)-350 + 'px';
//        document.getElementById ('ModalPopupDiv').style.left='350px';
//        
//        document.getElementById ('MaskedDiv').style.display='';
//        document.getElementById ('MaskedDiv').style.visibility='visible';
//        document.getElementById ('MaskedDiv').style.top='0px';
//        document.getElementById ('MaskedDiv').style.left='0px';
//        document.getElementById ('MaskedDiv').style.width=  document.documentElement.clientWidth + 'px';
//        document.getElementById ('MaskedDiv').style.height= document.documentElement.clientHeight+ 'px';
    }
    function CloseModelPopup()
    {
        document.getElementById ('MaskedDiv').style.display='none';
        document.getElementById ('ModalPopupDiv').style.display='none';
    }