function toggle(id, level){
	    ul = "ul_" + id;
	    img = "img_" + id;
	    ulElement = document.getElementById(ul);
	    imgElement = document.getElementById(img);
	    if (ulElement){
	            if (ulElement.className == 'sitemapClosed' + level){
	                    ulElement.className = "sitemapOpen" + level;
	                    imgElement.src = "/images/minus.gif";
	               }
	            else{
	                    ulElement.className = "sitemapClosed" + level;
	                    imgElement.src = "/images/plus.gif";
	             } // if closed
	     } // if ul
	  } // function