// JavaScript Document:二级导航菜单样式，其中prtStyle,subStyle,prtLiOnStyle,prtLiOffStyle为全局变量
//对子菜单切换样式函数
function navFix() 
{
	for (var i=0; i<prtIdArr.length; i++) 
	{
		document.getElementById(prtIdArr[i]).parentNode.className = prtLiOffStyle;
		document.getElementById(prtIdArr[i]).onclick = function()
		{
			this.parentNode.className = (this.parentNode.className == prtLiOffStyle) ? prtLiOnStyle : prtLiOffStyle;
		}
	}
}
//打开某个子菜单函数

function navOpen(prtId) 
{
	navFix();
	if (prtId != "")
		document.getElementById(prtId+"_li").className = prtLiOnStyle;
	else
		return;
}
//当前位置高亮显示函数
function navLocal(prtId, subId) 
{
	navOpen(prtId);
	document.getElementById(prtId).className = prtStyle;
	if (subId != "")
		document.getElementById(subId).className = subStyle;
	else
		return;
}