function preview(url){
	window.open(url, "preview");
}

function imageOver(imgId, imageUrl) {
	var img = new Image;
	img = document.getElementById(imgId);
	img.src = imageUrl;
}

function imageOff(imgId, imageUrl) {
	var img = new Image;
	img = document.getElementById(imgId);
	img.src = imageUrl;
}