flash/css and z index

I have a css menu which overlaps a flash file.

This works fine in IE but not in firefox.

In the flash file ive added the code.

  <param name="wmode" value="opaque">

But in firefox the css menu still appears under the flash file.

Any ideas.

Code for css menu
#menu {
      width: 714px;
      background: #0099FF;
      float: left;
      z-index: 100;
      height: 24px;
}

Code for flash file.
#adminmain
{
      font-family: Arial, Helvetica, sans-serif;
      font-size: 11px;
      color: #666666;
      text-decoration: none;
      text-align: left;
      padding:0px;
      width:357px;
      voice-family: "\"}\"";
      voice-family:inherit;
      width:357px;
      float: left;
      margin-top: 0px;
      height: 397px;
      background-image: url(../images/face_interact.jpg);
      background-repeat: no-repeat;
      background-position: left top;
      z-index:7
}