var images = new Array();
var t;

function preloadImages(){
	images[0] = new Image(450,170);
	images[0].src = "images/menu1.jpg";
	images[1] = new Image(450,170);
	images[1].src = "images/menu2.jpg";
	images[2] = new Image(450,170);
	images[2].src = "images/menu3.jpg";
	images[3] = new Image(450,170);
	images[3].src = "images/menu4.jpg";
	images[4] = new Image(450,170);
	images[4].src = "images/menu5.jpg";
	images[5] = new Image(450,170);
	images[5].src = "images/menu6.jpg";
	document.getElementById("thumbimage").src = images[0].src;
	positionLayer();
}

function positionLayer(){
	document.getElementById("hand").style.left = ((window.windowWidth()-950) / 2) + "px";
	if(windowHeight() != 0){
		document.getElementById("hand").style.top = ((window.windowHeight()-600) / 2) + "px";
	}
}

function windowWidth() {
	if (window.innerWidth) {
		return window.innerWidth;
	} else if (document.body && document.body.offsetWidth) {
		return document.body.offsetWidth;
	} else {
		return 0;
	}
}

function windowHeight(){
	if (window.innerHeight) {
		return window.innerHeight;
	} else if (document.body && document.body.offsetHeight) {
		return document.body.offsetHeight;
	} else {
		return 0;
	}
}

function showImage(imgNr){
	clearTimeout(t);
	document.getElementById("thumbimage").src = images[imgNr].src;
}

function hideImage(){
	t = window.setTimeout("document.getElementById('thumbimage').src = images[0].src",500);
}