window.onload = function(){
  dropDown();
}
function dropDown(){
 if (document.all&&document.getElementById) {
   navRoot = document.getElementById("nav");
   for (i=0; i<navRoot.childNodes.length; i++) {
     node = navRoot.childNodes[i];
     if (node.nodeName=="LI") {
      node.onmouseover=function() {
        this.className+=" over";
      }
      node.onmouseout=function() {
        this.className=this.className.replace(" over", "");
      }
     }
   }
 }
}

//Check if we're in IE 6
var agt				= navigator.userAgent.toLowerCase();
var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie6    = (is_ie && agt.indexOf("msie 6.")!=-1 );    


// Activate background image caching on IE6 to prevent image flicker
if (is_ie6) {
	document.execCommand('BackgroundImageCache', false, true);
}