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<!DOCTYPE html>
<html>
   <head>
        <meta charset="utf-8">
    <style type="text/css">
         #firstdiv  {
                 float: left;
                 z-index: 2; 
                 position:absolute;
                 margin-top: 12px;
                 height:150px; 
                 width=500px; 
                 border:solid 1 px red; 
                 background-color:wheat;
         }
         #seconddiv  {
             opacity: 0.7;
             float: left; 
             margin-top: 75px;
             z-index:3; 
             border: 1px dotted orange;
             position:relative;
             background-color:yellow;
          }
    </style>
   </head>
   <body>
        <div id="firstdiv">
             this is inside of a div tag
        </div>
        <div id="seconddiv">
            <form name="forwardForm">
                <input type="text">This is a field</input>
                <input type="button" value="Go!" onclick="hideThis();" />
            </form>
        <div>
    <script language="JavaScript">
         function hideThis() {
              var obj = document.getElementById('firstdiv');
              if (obj.style.display != 'none') {
                   obj.style.display = 'none';
              } else {
                   obj.style.display = 'block';
              }
         }
    </script>

   </body>
</html>