function hideOverlayImg() {
	var div = document.getElementById('img_overlay');
	div.style.display = "none";
}

function showOverlayImg(img) {
	var div = document.getElementById('img_overlay');
	div.innerHTML = "<img style=\"cursor:pointer\" onclick=\"hideOverlayImg()\" src=\"" + img + "\" alt=\"\" width=\"600\" height=\"450\" border=\"0\">";
	div.style.display = "block";
}

function displayLargeThumb(img) {
	var div = document.getElementById('large_thumb');
	div.innerHTML = "<img style=\"cursor:pointer\" onclick=\"showOverlayImg('" + img + "')\" src=\"" + img + "\" alt=\"\" width=\"360\" border=\"0\">";
}