function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null ) node = document;
	if ( tag == null ) tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}
function highlightNav() {
	var subnavs = getElementsByClass("subnav");
	var subnavheadings = getElementsByClass("subnavheading");
	for (var i=0;i<subnavs.length;i++) {
		subnavs[i].style.display="none";
	}
	for (var i=0;i<subnavheadings.length;i++){ //for each subnav heading
		if (parseUri(subnavheadings[i].href).relative == parseUri(location.href).relative) {
			subnavheadings[i].className = "current";
			if (subnavs[i].innerHTML.length>0) {
				subnavs[i].style.display="";
				subnavs[i].id = "cursubnav";
			}
		}
		pages = subnavs[i].getElementsByTagName("li");
		var pattern = new RegExp("http:\/\/(www2?\.)?bioinfo.ittc.ku.edu");
		for (k=0;k<pages.length;k++) {
			a = pages[k].getElementsByTagName("a")[0];
			if ((a.href.search(pattern)>=0) && (parseUri(a.href).relative == parseUri(location.href).relative)) {
				a.className = "current";
				subnavheadings[i].className = "current";
				if (subnavs[i].innerHTML.length>0) {
					subnavs[i].style.display = "";
					subnavs[i].id = "cursubnav";
				}
			}
		}
	}
}