Menu em IE6 e em mac??!!

Boas amigos,
tou a fazer um projecto, onde tenho um menu drop down que fui buscar a um dos muitos tutoriais css por aí espalhado...
so que o menu nao funciona no IE6, nem no mac?seja no opera ou no mozzila!!
alguem me sabe dixer como contornar esse problema? se for necessário meto o css..
e ja agora, pk funciona no mozzila aqui no windows e no portatil mac nao...

 

Ninguem??

 

Fica aqui o css, caso alguem dp descubra algo, apite...

Código:

/* Root = Horizontal, Secondary = Vertical */
ul#navmenu {
  margin: 0;
  border: 0 none;
  padding: 0;
  width: 962px; /*For KHTML*/
  list-style: none;
  height: 24px;
}

ul#navmenu li {
  margin: 0;
  border: 0 none;
  padding: 0;
  float: left; /*For Gecko*/
  display: inline;
  list-style: none;
  position: relative;
  height: 24px;
}

ul#navmenu ul {
  margin: 0;
  border: 0 none;
  padding: 0;
  width: 200px;
  list-style: none;
  display: none;
  position: absolute;
  top: 24px;
  left: 0;
}

ul#navmenu ul li {
  float: none; /*For Gecko*/
  display: block !important;
  display: inline; /*For IE*/
}

/* Root Menu */
ul#navmenu a {
  /*border: 2px solid #FFF;*/
  border: 2px solid #696969;
  padding: 0 6px;
  float: none !important; /*For Opera*/
  float: left; /*For IE*/
  display: block;
  background:#696969;
  color: #FFF;
  font: bold 10px/22px Verdana, Arial, Helvetica, sans-serif;
  text-decoration: none;
  height: auto !important;
  height: 1%; /*For IE*/
}

/* Root Menu Hover Persistence */
ul#navmenu a:hover,
ul#navmenu li:hover a,
ul#navmenu li.iehover a {
 /* background: #E10007;*/
  background: #E6E4CF;
  color: #8B864E;
  
}

/* 2nd Menu */
ul#navmenu li:hover li a,
ul#navmenu li.iehover li a {
  float: none;
  background: #E6E4CF;
  color: #666;
}

/* 2nd Menu Hover Persistence */
ul#navmenu li:hover li a:hover,
ul#navmenu li:hover li:hover a,
ul#navmenu li.iehover li a:hover,
ul#navmenu li.iehover li.iehover a {
  background: #8B864E;
  color: #FFF;
}

/* 3rd Menu */
ul#navmenu li:hover li:hover li a,
ul#navmenu li.iehover li.iehover li a {
  background: #EEE;
  color: #666;
}

/* 3rd Menu Hover Persistence */
ul#navmenu li:hover li:hover li a:hover,
ul#navmenu li:hover li:hover li:hover a,
ul#navmenu li.iehover li.iehover li a:hover,
ul#navmenu li.iehover li.iehover li.iehover a {
  background: #CDC673;
  color: #FFF;
}

/* 4th Menu */
ul#navmenu li:hover li:hover li:hover li a,
ul#navmenu li.iehover li.iehover li.iehover li a {
  background: #EEE;
  color: #666;
}

/* 4th Menu Hover */
ul#navmenu li:hover li:hover li:hover li a:hover,
ul#navmenu li.iehover li.iehover li.iehover li a:hover {
  background: #EEE8AA;
  color: #FFF;
}

ul#navmenu ul ul,
ul#navmenu ul ul ul {
  display: none;
  position: absolute;
  top: 0;
  left: 200px;
}

/* Do Not Move - Must Come Before display:block for Gecko */
ul#navmenu li:hover ul ul,
ul#navmenu li:hover ul ul ul,
ul#navmenu li.iehover ul ul,
ul#navmenu li.iehover ul ul ul {
  display: none;
}

ul#navmenu li:hover ul,
ul#navmenu ul li:hover ul,
ul#navmenu ul ul li:hover ul,
ul#navmenu li.iehover ul,
ul#navmenu ul li.iehover ul,
ul#navmenu ul ul li.iehover ul {
  display: block;
}