function expand(target) {
	var children=target.getElementsByTagName("ul");
	if (children.length>0) {
		children[0].style.display="block"
	} 
}
function contract(target) {
	var children=target.getElementsByTagName("ul");
	if (children.length>0) {
		children[0].style.display="none"
	}
}
function init_expand() {
	for (var x=0; x<document.getElementById('page_menu').childNodes.length; x++) {
		current_child=document.getElementById('page_menu').childNodes[x]
		if (current_child.parentNode.parentNode.parentNode==document.getElementById('page_menu')) {
			
		}
	}
}