menuup = new Image();
menuup.src = "./image/buttonup.png" ;
menudown = new Image() ;
menudown.src = "./image/buttondown.png" ;
function buttondown( node ) {
	var img = getFirstElement(node, "IMG");
	if (img) { img.src = menudown.src; }
}
function buttonup ( node ) {
	var img = getFirstElement(node, "IMG");
	if (img) { img.src = menuup.src; }
}
function getFirstElement(node, elementName) {
	if ( node.nodeName == elementName ) {
		return node;
	}
	var child = node.firstChild;
	while ( child != null ) {
		if ( child.nodeType == 1 ) {
			var child2 = getFirstElement(child, elementName);
			if ( child2 ) {
				return child2;
			}
		}
		child = child.nextSibling;
	}
	return null;
}