Nice Menu not expanding in IE6

Okay here's what we did, we are not using the nice_menus.module at all.

In our style.css page we included the following:

/**
 * CSS dropdown menu inspired by Son of Suckerfish...
 * http://www.htmldog.com/articles/suckerfish/dropdowns/
 * http://www.alistapart.com/articles/horizdropdowns
 */
#nav ul.menu { /* top level ul */
  padding: 0px 0px 0px 0px;
  margin: 0;
  margin-top: 0px;
  list-style: none;
  height: 1.8em;
  background-color: #DF790B;
  display: block;
  float: right;
  z-index: 100;
} 

#nav a {
  padding: 0 8px;
  margin: 0;
  line-height: 1.8em;
  color: white;
  background-color: #DF790B;
  text-decoration: none;
  display: block;
  border-left: 1px solid #EBB042;
  border-right: 1px solid #EBB042;
  border-bottom: 1px solid #EBB042;
}

#nav a:hover {
  color: white;
  background-color: #EBB042;
  text-decoration: underline;
}

#nav a.active {
  text-decoration: none;
  background-color: #00069C;
}

#nav li {
  display: inline;
  float: left;
  margin: 0;
  padding: 0;
  /*width: 10em;/* fixed width works better, but looks ugly */
}

/* second-level lists */

#nav ul.menu ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

#nav li ul {
  position: absolute;
  width: 13.8em; 
  left: -999em; /* to hide menu because display: none isn't read by screen readers */
}

#nav li li {
  float: left;
  width: 13.8em;
}

#nav li ul a {
  padding: 0em 8px 0em 1em;
  width: 13em;
  line-height: 1.8em;
  color: white;
  background-color: #DF790B;
  border-bottom: 1px solid #EBB042;
}

#nav li ul a:hover {
  color: white;
  background-color: #EBB042;
}

#nav li ul ul {
  margin: -1.3em 0 0 14em;
}

#nav li:hover ul ul, #nav li:hover ul ul ul, #nav li.sfhover ul ul, #nav li.sfhover ul ul ul {
  left: -999em;
}

#nav li:hover ul, #nav li li:hover ul, #nav li li li:hover ul, #nav li.sfhover ul, #nav li li.sfhover ul, #nav li li li.sfhover ul {
  left: auto;
}

/* end of the menu stuff */

where #nav is replaced with the id of the div where your menu is to be placed. Note that positional CSS above is important, but the color/background color/font is not. You can change these to suit your site.

In your page.tpl.php file include the following in the head tag of your page.

<!-- We only want to include the JS for IE, not browsers capable of doing everything in css --> 
<!--[if lte IE 7]>
<script type="text/javascript">
sfHover = function() {
     var sfEls = document.getElementById("nav").getElementsByTagName("LI");
     for (var i=0; i<sfEls.length; i++) {
          sfEls[i].onmouseover=function() {
             this.className+=" sfhover";
          }
          sfEls[i].onmouseout=function() {
             this.className=this.className.replace(new RegExp("sfhover"), "");
          }
     }
}
if (window.attachEvent) window.attachEvent("onload", sfHover);
</script>
<style type="text/css">
#nav li:hover{
  position: static;
}
</style>
<![endif]-->

where again you replace the nav id with your menu's div id.

Hope this helps.