// return next node in document order
function nextNode(node) {
    if (!node) return null;
    if (node.firstChild){
        return node.firstChild;
    } else {
        return nextWide(node);
    }
}
// helper function for nextNode()
function nextWide(node) {
    if (!node) return null;
    if (node.nextSibling) {
        return node.nextSibling;
    } else {
        return nextWide(node.parentNode);
    }
}
// return previous node in document order
function prevNode(node) {
    if (!node) return null;
    if (node.previousSibling) {
      return previousDeep(node.previousSibling);
    }
    return node.parentNode;
}
// helper function for prevNode()
function previousDeep(node) {
    if (!node) return null;
    while (node.childNodes.length) {
        node = node.lastChild;
    }
    return node;
}

/* Show & hide dropdown menus */
startup = function() {
	if (document.all && document.getElementById) {
		var node = document.getElementById("navbar");
		while(node) {
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
			node = nextNode(node);
		}
	}
}

/*

		navRoot = document.getElementById("navlevel2");
		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= startup;