/* function to toggle visibility */
function toggle( targetId, signId ) {
   if ( document.getElementById ) {
    target = document.getElementById( targetId );
	if (signId != '') {sign = document.getElementById( signId );}
    if ( target.style.display == "none" ) {
     target.style.display = "";
	 if (sign) {sign.src = sign.src.replace('plusSign','minusSign');}
    } else {
     target.style.display = "none";
	 if (sign) {sign.src = sign.src.replace('minusSign','plusSign');}
    }
   }
}

startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("topnav");
		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", "");
				}
			}
		}
	}
}
window.onload=startList;