if (document.images) {
	aboutOff = new Image(); aboutOff.src="/images/nav/about.gif";
	aboutOn = new Image(); aboutOn.src="/images/nav/aboutOn.gif";
	practiceOff = new Image(); practiceOff.src="/images/nav/practice.gif";
	practiceOn = new Image(); practiceOn.src="/images/nav/practiceOn.gif";
	profilesOff = new Image(); profilesOff.src="/images/nav/profiles.gif";
	profilesOn = new Image(); profilesOn.src="/images/nav/profilesOn.gif";
	newsOff = new Image(); newsOff.src="/images/nav/news.gif";
	newsOn = new Image(); newsOn.src="/images/nav/newsOn.gif";
	locOff = new Image(); locOff.src="/images/nav/location.gif";
	locOn = new Image(); locOn.src="/images/nav/locationOn.gif";
	historyOff = new Image(); historyOff.src="/images/nav/history.gif";
	historyOn = new Image(); historyOn.src="/images/nav/historyOn.gif";
}


function img_act(img) {
	if (document.images) {
	imgOn = eval(img + "On.src");
	document [img].src = imgOn;
	}
}

function img_inact(img) {
	if (document.images) {
	imgOff = eval(img + "Off.src");
	document [img].src = imgOff;
	}
}

var popupWindow = null;

function popup(url, features, width, height, x, y)
{
	if(popupWindow != null && !popupWindow.closed)
		popupWindow.close();
	
	popupWindow = window.open(url, "popupWindow", features+",width="+width+",height="+height+",screenX="+x+",screenY="+y+",left="+x+",top="+y);
	
	return popupWindow;
}