var clicked = null;
		var lastClick =null;
		
		if (document.images) {
		buttonson=new MakeArray(8);
		buttonsoff=new MakeArray(8);
		
		for (var i=1; i<9; i++){
		buttonson[i].src="pics_nav/but_on"+i.toString() + ".gif";
		buttonsoff[i].src="pics_nav/but_off"+i.toString() + ".gif";
		}
		}
	
              function MakeArray(n) {
              this.length = n
              for (var i = 1; i<=n; i++) {
                     this[i] = new Image()
              }
              return this
               }
		
		function activate(name) {
		if (document.images)
		document['P' + name.toString()].src = buttonson[name].src;
		}
		


		function deActivate(name) {
		if (document.images && (name!=clicked) )
		document['P' + name.toString()].src = buttonsoff[name].src;
		}
               
                
        function setClick(name) {
		clicked = name;
		if (lastClick != null) {
		deActivate(lastClick);
		}
		lastClick = clicked;
		}
		
		function changePages(navig_topURL,inhaltURL){
		parent.navig_top.location.href=navig_topURL;
		parent.inhalt.location.href=inhaltURL;
		
		}