Hover-Effekt: z-index wird im IE 6 nicht verwendet

[Kolja]

Hallo,

ich habe mittels diesem css einen Hovereffekt erstellt, der bei allen getesten Browsern, außer dem IE funktioniert:

/*
#menucontainer {position:relative;}
#menu {text-align:center; position:relative; height:8em;}

.box {position:relative; float:left; top:0px; padding-bottom:5px; padding-right:2px;}

#menu a:visited {text-decoration:none; background-color:#577039; color:#BDA960; font-family: Verdana, Arial, sans-serif; font-weight: bold; display:block; width:70px; height:15px; font-size:10px; padding:5px;}

#menu a {position:relative; text-decoration:none; background-color:#577039; color:#BDA960; font-family: Verdana, Arial, sans-serif; font-weight: bold; display:block; width:70px; height:15px; font-size:10px; padding:5px;}
#menu a span.desc {display:none;}
#menu a .topleft {position:absolute; right:0px; bottom:0px; width:0px; height:0px; overflow:hidden; border-left:10px solid #577039; border-bottom:10px solid #fff;}
#menu a .topright {position:absolute; right:70px; bottom:0px; width:0px; height:0px; overflow:hidden; border-right:10px solid #577039; border-bottom:10px solid #fff;}

#menu a:hover {text-decoration:none; background-color:#96864D; color:#eee; font-family: Verdana, Arial, sans-serif; font-weight: bold; display:block; width:70px; height:15px; font-size:10px; padding:5px;}

#menu a:hover .topleft {border-left:10px solid #96864D; border-bottom:10px solid #fff;}
#menu a:hover .topright {border-right:10px solid #96864D; border-bottom:10px solid #fff;}

#menu a:active {text-decoration:none; background-color:#577039; color:#000; font-family: Verdana, Arial, sans-serif; display:block; width:70px; height:15px; font-size:10px; padding:5px;}
#menu a:hover span.desc {display:block; position:absolute; left:0px; top:35px; height: auto; width:150px; padding:5px; background-color:#fff; color:#000; border:1px solid #234; z-index:5; font-family: Verdana, Arial, sans-serif; font-weight:100;}
*/

Das ganze ist hier zu sehen: http://relaunch.zauselmonster.de

Kann man alternativ dafür sorgen, dass die Infos im IE nicht angezeigt werden?