function menu_show( curr ) {
    if (curr.lastChild && curr.lastChild.nodeType == 1) {
	 curr.lastChild.style.display = 'block';
    }
}

function menu_hide( curr ) {
    if (curr.lastChild && curr.lastChild.nodeType == 1) {
	 curr.lastChild.style.display = 'none';
    }
}

function menu_sub( curr ) {
     curr.onmouseover = function() {
	 this.style.display = 'block';
     }

     curr.onmouseout = function() {
	 this.style.display = 'none';
    }
}