[Solved] Overlay appear above a button


Sorry for being so general on my question. The following is some code I did to get a positive result:

<html>
<head>
    <META HTTP-EQUIV="EXPIRES" CONTENT="-1" />
    <script type="text/javascript">
      function setVisibility(id) {
        if(document.getElementById('bt1').value=='Hide Layer'){
          document.getElementById('bt1').value="Show Layer";
          document.getElementById(id).style.display = 'none';
        }else{
          document.getElementById('bt1').value="Hide Layer";
          document.getElementById(id).style.display = 'inline';
        }
      }
    </script>
    <style type="text/css">

        #container {
            width:1px;
            height:1px;
            position: relative;
        }
        #nav,
        #data {
            display:block;
            position:absolute;
            width:100%;
            bottom:100%; /* change to TOP and it will drop down */
            background: #fff;
        }

        #data{
            z-index: 10;
        }

    </style>
</head>
<body>
    <p>test text</p>
    <p>test text</p>
    <p>test text</p>
    <p>test text</p>
    <div id="container">
        <div id="nav"></div>
        <div id="data" >
            blah<br>
            blah<br>
            blah<br>
            blah<br>
        </div>
    </div>
    <input type=button name=type id='bt1' value="Hide Layer"
       onclick="setVisibility('data')";>
    <script> setVisibility('data'); </script>
</body>
</html>

1

solved Overlay appear above a button