 <script language="javascript" type="text/javascript">
        function hid()
        {
        var div4=document.getElementById("div1");
        div4.style.display="block";
        div4.style.width="200px";
        div4.style.height="150px";
        div4.style.zIndex="9999";
        div4.style.top="30%";
        div4.style.left="32%";
        div4.style.position="absolute";
        var div3=document.getElementById("div2");
        div3.style.display="block";
        div3.style.width="1000px";
        div3.style.zIndex="9998";
        div3.style.position="absolute";
        div3.style.height=document.body.offsetHeight;
        div3.style.top="0px";
        div3.style.left="0px";

        }
        function vis()
        {
        var div4=document.getElementById("div1");
        div4.style.display="none";
        var div3=document.getElementById("div2");
        div3.style.display="none";
        div3.style.width="0px";
        div3.style.height="0px";
       
        }
    </script>
