function showImgList(elmId, className) {
	hideImgList(elmId, className);
	/** gewähltes element einblenden */
	var elm = document.getElementById(elmId);
	elm.style.display = "block";
}

function hideImgList(elmId, className) {
	/** alle elemente mit className ausblenden */
	var elements = getElementsByClass(className, document, 'img');
	for(var i=0; i<elements.length; i++) {
		elements[i].style.display = "none";
	}
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\\\s)'+searchClass+'(\\\\s|$)');
	for (var i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}