function setupEvents(){
	var showcase_previews = null;
		
		if (document.querySelectorAll) {
			showcase_previews = document.querySelectorAll('div.showcase_preview');
		} else if (document.getElementsByClassName) {
			showcase_previews = document.getElementsByClassName('showcase_preview');
		}

			for (var i = 0; i < showcase_previews.length; i++){
				showcase_previews[i].onclick=showBlock;
			}
		}
							
	
	function showBlock(evnt) {
		var theEvent = evnt ? evnt : window.event;
		var theSrc = theEvent.target ? theEvent.target : theEvent.srcElement;
		var itemID = "wowslider-container" + theSrc.id.substr(16,1);
		
		// hide all images
		for (var i=1; i<4; i++){
			var allImagesID = "wowslider-container" + [i];
			var allImages = document.getElementById(allImagesID);
			allImages.style.display='none';
		}
		// (re)display the correct image in the right place	
		var item = document.getElementById(itemID);
		item.style.display='block';

	}