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IE 6 z-index and position: fixed; issue
<body>
  <div class="header"> </div>
  <div id="content-wrapper">
  <a href="/some.html"><div class="feedback_div"></div></a>
  </div>
  <div id="footer-wrapper"></div>
</body>

/* IE 6 only */
* .feedback_div
{
    z-index: 9998;
    position: absolute;
    top: expression( (( t=document.documentElement.scrollTop) ? t: document.body.scrollTop) +'px');
    right: -140px;
}
* #content-wrapper
{
    position: relative;
    z-index: 9999;
}
* #footer-wrapper
{
    z-index: 0;
    position: relative;
}
* html
{
overflow: auto;
}
* html body
{
height: 100%; /* required */
}
/* END: IE 6 only */