//	function hideHtmlElement(htmlElement) {
//		htmlElement.style.visibility="hidden";
//	}

//	function showPicture() {
//		document.getElementById('overlay').style.visibility="visible";
//	}

	function displayOverlayImage(src, title) {

		var overlayImage = getOverlayImage();
		//setImageSrc(overlayImage, src);
		overlayImage.setAttribute('src', src);
		overlayImage.setAttribute('title', title);
		
		//var caption = document.getElementById('overlay-image-title');
		//caption.setAttribute('text', title);
		
		
		//if (overlayImage.style.visibility != "visible") {
			hideHtmlElement(getDefaultLayer()); //setAttribute("style", "visibility=hidden");

			var overlayImageBlock = getOverlayImageLayer();
			showHtmlElement(overlayImageBlock);
		//}
			
		//return true;
	}
	
	function hideOverlayImage() {
		hideHtmlElement(getOverlayImageLayer());
		showHtmlElement(getDefaultLayer());
	}
	
	//onclick="setOverlayImageSrc('img/100_0285_tn.jpg');"
	function setImageSrc(img, newSrc) {
		var srcName = 'src';
		//var currentSrc = img.getAttribute(srcName)
		//alert(currentSrc);
		img.setAttribute(srcName, newSrc);
	}

	function getOverlayImageLayer() {
		return document.getElementById('overlay-image-layer');
	}	
	
	function getOverlayImage() {
		return document.getElementById('overlay-image');
	}
	
	function getDefaultLayer() {
		return document.getElementById('default-layer');	
	}
	
	function hideHtmlElement(element) {
		element.style.visibility="hidden";	
	}
	function showHtmlElement(element) {
		element.style.visibility="visible";	
	}
	function test() {
		window.alert("test");
	}