function showThumb(img){
	var thumb = document.getElementById("thumb");
	thumb.src = img.src;
	thumb.alt = img.alt;
	thumb.title = img.title;
	var left = img.x ? img.x : getLeft(img);
	var top = img.y ? img.y : getTop(img);
	thumb.style.left = left - ((parseInt(thumb.style.width) - img.width)/2);
	thumb.style.top = top - ((parseInt(thumb.style.height) - img.height)/2);
	thumb.style.visibility = "visible";

	function getLeft(element){
		if(!element) return 0;
		var left = getLeft(element.offsetParent) + element.offsetLeft;
		return left;
	}
	function getTop(element){
		if(!element) return 0;
		var top =  getTop(element.offsetParent) + element.offsetTop;
		return top;
	}
}

function hideThumb(){
	var thumb = document.getElementById("thumb");
	thumb.src = "";
	thumb.alt = "";
	thumb.title = "";
	thumb.style.visibility = "hidden";
}