// MMI : Main Menu index (for SchoolSpace)
var MMI_HOMEPAGE	= 0;
var MMI_REGISTER	= 1;
var MMI_COURSEINTRO	= 2;
var MMI_EC			= 3;
var MMI_DOWNLOAD	= 4;
var MMI_HELP		= 5;


//初始化导航菜单
function SetCurrentMenuItem(nIndex)
{
	// 替换图片
	var oImg = document.all("ItemImage")[nIndex];

	var sImg = oImg.src;
	var sExt = GetExtension(sImg);
	sImg = sImg.substr(0, sImg.length - sExt.length);	// 得到不含扩展名的路径
	sImg += ("_Selected" + sExt);	// 添加_Selected 和 扩展名

	oImg.src = sImg;


/*
	// 去掉链接
	var oParent = oImg.parentElement;
	if (oParent.tagName == "A") oParent.outerHTML = oParent.innerHTML;
*/
}

function GetExtension(sFilePath)
{
	sFilePath = sFilePath.substr(sFilePath.lastIndexOf("."));
	return sFilePath;
}