var aRoll = new Array();

function initNav()
{
	aRoll["nav1"] = new rollImgObj("nav-about.gif", "nav-about-sel.gif");
	aRoll["nav2"] = new rollImgObj("nav-investor.gif", "nav-investor-sel.gif");
	aRoll["nav3"] = new rollImgObj("nav-properties.gif", "nav-properties-sel.gif");
	aRoll["nav4"] = new rollImgObj("nav-environment.gif", "nav-environment-sel.gif");
	aRoll["nav5"] = new rollImgObj("nav-news.gif", "nav-news-sel.gif");
	aRoll["nav6"] = new rollImgObj("nav-events.gif", "nav-events-sel.gif");
}

function rollImgObj(sOffName, sOnName)
{
	this.onImg = new imgObj(sOnName);
	this.offImg = new imgObj(sOffName);
}

function imgObj(sFileName)
{
	var sPath = "/images/";
	var oImg = new Image();
	oImg.src = sPath + sFileName;
	return oImg;
}

function imgOn(oImg)
{
	if(aRoll[oImg.id])
		oImg.src = aRoll[oImg.id].onImg.src;
}

function imgOff(oImg)
{
	if(aRoll[oImg.id])
		oImg.src = aRoll[oImg.id].offImg.src;
}