function showCase(imageURL) {
	var newWindow = window.open("js/blank.html", "Vergrößerung", "width=660, height=500, left=100, top=100");
	var imgTag = document.createElement("img");
	var src = document.createAttribute("src");
	src.nodeValue = imageURL;
	imgTag.setAttributeNode(src);
	var returnSpace = newWindow.document.getElementById("ausgabe");
	returnSpace.appendChild(imgTag);
	newWindow.focus();
}