function on1() 
{if (!document.images) return; document.a.src = "images/butt_about_sel.JPG";} 
function on2() 
{if (!document.images) return; document.b.src = "images/webdesign.jpg";}
function on3() 
{if (!document.images) return; document.c.src = "images/voip.jpg";}
function on4() 
{if (!document.images) return; document.d.src = "images/favoriten.jpg";}
function on5() 
{if (!document.images) return; document.e.src = "images/kontakt.jpg";}

function off1() 
{if (!document.images) return; document.a.src = "images/home-b.jpg";}
function off2() 
{if (!document.images) return; document.b.src = "images/webdesign-b.jpg";}
function off3() 
{if (!document.images) return; document.c.src = "images/voip-b.jpg";}
function off4() 
{if (!document.images) return; document.d.src = "images/favoriten-b.jpg";}
function off5() 
{if (!document.images) return; document.e.src = "images/kontakt-b.jpg";}

var imgslist = new Array(
"images/lable_about_sel.JPG",
"images/lable_webdesign.jpg",
"images/lable_voip.jpg",
"images/lable_favoriten.jpg",
"images/lable_kontakt.jpg",
"images/lable_home_sel.gif",
"images/labelbar_sitemap_sel.gif"); 

var imgs=new Array(); 
for (x=0; x<imgslist.length; x++) 
 if (document.images) 
  {imgs[x]=new Image(); imgs[x].src = imgslist[x];}