JS-Code "umkehren"

function P91Fadeout(id, geschwindigkeit) {
   var fps = Math.round(geschwindigkeit / 100);
   var tmp = 0;
    for(i = 100; i >= 0; i--) {
        setTimeout("P91Fadeout_fade('" + id + "'," + i + ")", (tmp * fps));
        tmp++;
    }
}


function P91Fadeout_fade(id, pas) {
   var heurix = document.getElementById(id).style;
   if(pas > 0) {
      heurix.opacity = (pas / 100);
      heurix.MozOpacity = (pas / 100);
      heurix.KhtmlOpacity = (pas / 100);
      heurix.filter = "alpha(opacity=pas / 100)";
   } else {
      heurix.display = "none";
      heurix.opacity = "100";
      heurix.MozOpacity = "100";
      heurix.KhtmlOpacity = "100";
      heurix.filter = "alpha(opacity=100)";
   }
}

function ausblenden() {
P91Fadeout('div1', 500);
}