Java-Menu auch im Netscape?

[paschy]

Hallo ich habe hier folgendes menu:

<STYLE>
#contextMenu
{
  position: absolute;
  visibility: hidden;
  width: 202px;
  background-color: #F0F0F0;
  layer-background-color: #F0F0F0;
  border: 2px outset white;
}

a.menu
{
 font-weight: bold;
 color: #777777;
 width: 100%;
 cursor: default;
}

a.menuOn
{
 color: #999999;
 font-weight: bold;
 width: 100%;
 cursor: hand;
}
</STYLE>
<SCRIPT>
var menu;
var a, b, c, g;
function showMenu (evt,d,e,f,h) {

a = d;
b = e;
c = f;
g = h;

if (document.all) {
    document.all.contextMenu.style.left = document.body.scrollLeft + event.clientX
    document.all.contextMenu.style.top = document.body.scrollTop + event.clientY
    document.all.contextMenu.style.visibility = 'visible';
    return false;
  }
  else if (document.layers) {
    if (evt.which == 3) {
      document.contextMenu.left = evt.x;
      document.contextMenu.top = evt.y;
      document.contextMenu.onmouseout =
      function (evt) { this.visibility = 'hide'; };
      document.contextMenu.visibility = 'show';
      return false;
    }
  }
  else if (document.getElementById) {
    if (evt.button == 3) {
      evt.preventDefault();
      var menu = document.getElementById('contextMenu');
      menu.style.left = evt.pageX + 'px';
      menu.style.top = evt.pageY + 'px';
      menu.style.visibility = 'visible';
      return false;
    }
  }
  return true;
}
function goto_kolo()
{
 location.href = "index.php?p=inseln&p2=reserve&k_o=" + escape(a) + "&k_ig=" + escape(b) + "&k_in=" + escape(c);
}

function goto_spio()
{
 location.href = "index.php?p=spio&view=true&id=" + escape(g);
}
</SCRIPT>

mein problem is, dass das ganze nur im IE mit onclick=showMenu(onclick,1,1,1,1) funktioniert aber bei Netscape nix geht... vielleicht kann mir ja jemand helfen

gruss paschy