function donavhighlights(){
	var theme=document.getElementById("main_content");
   if(!document.layers){
      var atags=document.getElementsByTagName("a");
      for(var i=0;i<atags.length;i++){
		checkLink=atags[i].href;
		myRegExp=/%20/g;
		newLink=checkLink.replace(myRegExp," ");
		documentLink=document.location.href.replace(myRegExp," ");
		newLink=newLink.toUpperCase();
		documentLink=documentLink.toUpperCase();
/* check to see if current link or one of submenu links are valid */
            if(documentLink.indexOf(newLink)!=-1){
            	atags[i].className=theme.className;
				atags[i].parentNode.className=theme.className;
				if(atags[i].parentNode.parentNode.parentNode.nodeName=="LI") {
				atags[i].style.color="#666666";
				atags[i].parentNode.parentNode.parentNode.childNodes[0].className=theme.className;
				atags[i].parentNode.parentNode.parentNode.className=theme.className;
				}
            }
         }
   }
}