/**
 * 菜单划过呈现事件
 * @Param menuLink 被划过的菜单项链接
 */
function show_menu(menuLink){
	var curLi = menuLink.parentNode;
	if(curLi.id != ""){
		var sub_menu_id = curLi.id + "_sub_menu";
		var sub_menu = document.getElementById(sub_menu_id);
		sub_menu.style.display = "block";
	}
	var child = curLi.parentNode.firstChild;
	while(child != null){
		if(child.id){
			if(child.id != ""){
				if(child != curLi){
					var sub_menu_id = child.id + "_sub_menu";
					var sub_menu = document.getElementById(sub_menu_id);
					sub_menu.style.display = "none";
				}
			}
		}
		child = child.nextSibling;
	}
}

/**
 * 菜单点击关闭事件
 * @Param menuLink 被点击的菜单项链接
 */
function hide_me(menuLink){
	var curLi = menuLink.parentNode;
	if(curLi.id != ""){
		var sub_menu_id = curLi.id + "_sub_menu";
		var sub_menu = document.getElementById(sub_menu_id);
		sub_menu.style.display = "none";
	}
}

/**
 * 隐藏所有的子菜单项
 */
function hide_all(){
	var menus = document.getElementById("all_nav_menus");
	var child = menus.firstChild;
	while(child != null){
		if(child.id){
			if(child.id != ""){
				var sub_menu_id = child.id + "_sub_menu";
				var sub_menu = document.getElementById(sub_menu_id);
				sub_menu.style.display = "none";
			}
		}
		child = child.nextSibling;
	}
}