// JavaScript Document

// ドロップダウン用
function dropdown_menu()
{
	var timeout    = 500;
	var closetimer = 0;
	var ddmenuitem = 0;
	
	function nav_open()
	{  nav_canceltimer();
	   nav_close();
	   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}
	
	function nav_close()
	{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}
	
	function nav_timer()
	{  closetimer = window.setTimeout(nav_close, timeout);}
	
	function nav_canceltimer()
	{  if(closetimer)
	   {  window.clearTimeout(closetimer);
		  closetimer = null;}}
	
	$(document).ready(function()
	{  $('#nav > li').bind('mouseover', nav_open)
	   $('#nav > li').bind('mouseout',  nav_timer)});
	
	document.onclick = nav_close;
};