function changeBlock(id) {
		
		for (i = 1;i<6;i++) {
			document.getElementById("block"+ i).style.display = "none";
			document.getElementById("bild" + i).src = "/images/stege/block" + i + ".gif"
		}
		document.getElementById("block"+ id).style.display = "block";
		document.getElementById("bild" + id).src = "/images/stege/block" + id + "_on.gif"
	}
	
	var lobj = 0;
	
	function displayObject(id) {
	var obj = document.getElementById(id);
	if (!lobj) {
		obj.style.display = "block";
		lobj = obj
	} else {
		if (obj.getAttribute("id") == lobj.getAttribute("id")) {
			obj.style.display = "none";
			lobj = 0;
		} else {
			lobj.style.display = "none";
			obj.style.display = "block";
			lobj = obj
			}
		}
	}

	/* Client-side access to querystring name=value pairs
		Version 1.2.3
		22 Jun 2005
		Adam Vandenberg
	*/
	function Querystring(qs) { // optionally pass a querystring to parse
		this.params = new Object()
		this.get=Querystring_get
		
		if (qs == null)
			qs=location.search.substring(1,location.search.length)
	
		if (qs.length == 0) return
	
	// Turn <plus> back to <space>
	// See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
		qs = qs.replace(/\+/g, ' ')
		var args = qs.split('&') // parse out name/value pairs separated via &
		
	// split out each name=value pair
		for (var i=0;i<args.length;i++) {
			var value;
			var pair = args[i].split('=')
			var name = unescape(pair[0])
	
			if (pair.length == 2)
				value = unescape(pair[1])
			else
				value = name
			
			this.params[name] = value
		}
	}
	
	function Querystring_get(key, default_) {
		// This silly looking line changes UNDEFINED to NULL
		if (default_ == null) default_ = null;
		
		var value=this.params[key]
		if (value==null) value=default_;
		
		return value
	}
	
	
	function showall() {
		document.getElementById('cart').style.overflow="visible"
	}
	
	function showone() {
		document.getElementById('cart').style.overflow="hidden"
	}