var p;
var txt;
var nAlpha = 100;
var picNow = 1;
var nSpeed = 5;

function beginFade() {
	p = document.getElementById("mapPic");
	txt = document.getElementById("txtLocation");
	fading();
}
function fading() {
	setAlpha(p,nAlpha);
	nAlpha -= nSpeed;
	if (nAlpha > 1) setTimeout("fading()",50);
	else {
		if (picNow == 1) {
			p.src = "images/map.jpg";
			picNow = 2;
		}
		else {
			picNow = 1;
			p.src = "images/location_map.jpg";
		}
		fadingBack();
	}
}

function fadingBack() {
	nAlpha += nSpeed;
	setAlpha(p,nAlpha);
	if (nAlpha < 99) setTimeout("fadingBack()",50);
	else {
		setAlpha(p,100);
		if (picNow == 2) txt.innerHTML = "enlarge";
		else txt.innerHTML = "zoom";
	}
}

function setAlpha(obj,per) {
	inone = per / 100;
	if (inone >= 1) inone = 0.99;
	obj.style.opacity = inone;
	obj.style.MozOpacity = inone;
	obj.style.KhtmlOpacity = per / 100;
	obj.style.filter = "alpha(opacity=" + per + ")";
}