if (window.navigator.platform.substr(0,3).toLowerCase()=="mac" && window.navigator.appName=="Microsoft Internet Explorer") {
 document.write('<link type="text/css" rel="stylesheet" href="stylesiemac.css" />');
} 

function disAlter(sEvent) {
  var cStyles=document.styleSheets;
  if(!cStyles) cStyles=document.getElementsByTagName("LINK");

  for(var s=0;s<cStyles.length;s++) {
    if (cStyles[s].title=="alternatif") {
       cStyles[s].disabled=true;
       break;
    }
  }
  if(sEvent!="before") {
    var oMenu=document.getElementById("menu");
    oMenu.style.display="block";
  }
}

if (document.styleSheets) {
  disAlter("before");
} else {
  document.write("<style>#menu {display:none;}</style>");
  window.onload=disAlter;
}