function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "ext")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;

function images() {
 var imgs = document.getElementsByTagName("img");
 for(var i = 0; i < imgs.length; i++) {
    var img=imgs[i];
    img.style.visibility = "hidden";
 }
}

function div1() {
  var div = document.getElementById("odiv");
  div.style.visibility = "hidden";
  var div2 = document.getElementById("head");
  div2.style.overflow = "visible";  
}

if (navigator.appName == 'Microsoft Internet Explorer') {
   window.onload = images;
}

if (navigator.appName == 'Netscape') {
   window.onload = div1;
}