function hover(a) {
switch(a)
{
case "link_default_start_id":
  var url ='url(./images2/Buttons/Start_ho.jpg)'
  break;    
case "link_WUEU_id":
  var url ='url(./images2/Buttons/WUEU_ho.jpg)'
  break;
case "link_prog_id":
  var url ='url(./images2/Buttons/programm_ho.jpg)'
 break;
case "link_Gaestebuch_id":
  var url ='url(./images2/Buttons/Gaestebuch_ho.jpg)'
  break;
case "link_kontakt_id":
  var url ='url(./images2/Buttons/Kontakt_ho.jpg)'
  break; 
case "link_links_id":
  var url ='url(./images2/Buttons/links_ho.jpg)'
  break; 
case "link_Bilder_id":
  var url ='url(./images2/Buttons/Bilder_ho.jpg)'
  break; 
case "intern_link_id":
  var url ='url(./images2/Buttons/intern_ho.jpg)'
  break; 
case "link_Sport_id":
  var url ='url(./images2/Buttons/Sport_ho.jpg)'
  break; 
case "link_Haus_id":
  var url ='url(./images2/Buttons/Haus_ho.jpg)'
  break; 
case "test2_id":
  var url ='url(./images2/Buttons/login_ho.jpg)'
  break;
case "intern_newpass_link_id":
  var url ='url(./images2/Buttons/lostpass_ho.jpg)'
  break;
case "intern_register_link_id":
  var url ='url(./images2/Buttons/register_ho.jpg)'
  break; 
case "link_weu_zurueck_id":
  var url ='url(./images2/Buttons/zurueck_ho.jpg)'
  break; 
case "link_weu_prinzipien_id":
  var url ='url(./images2/Buttons/prinzipien_ho.jpg)'
  break; 
case "link_weu_aktivenvorstand_id":
  var url ='url(./images2/Buttons/vorstand_ho.jpg)'
  break;
case "link_weu_vorneu_id":
  var url ='url(./images2/Buttons/vorstandneu_ho.jpg)'
  break;  
  case "link_aktivitaeten_id":
  var url ='url(./images2/Buttons/aktivitaeten_ho.jpg)'
  break;         
 }            
document.getElementById(a).style.backgroundImage = url;
}

function hover_non(a) {
switch(a)
{
case "link_default_start_id":
  var url ='url(./images2/Buttons/Start_no.jpg)'
  break;    
case "link_WUEU_id":
  var url ='url(./images2/Buttons/WUEU_no.jpg)'
  break;
case "link_prog_id":
  var url ='url(./images2/Buttons/programm_no.jpg)'
  break;
case "link_Gaestebuch_id":
  var url ='url(./images2/Buttons/Gaestebuch_no.jpg)'
  break;
case "link_kontakt_id":
  var url ='url(./images2/Buttons/Kontakt_no.jpg)'
  break; 
case "link_links_id":
  var url ='url(./images2/Buttons/links_no.jpg)'
  break; 
case "link_Bilder_id":
  var url ='url(./images2/Buttons/Bilder_no.jpg)'
  break; 
case "intern_link_id":
  var url ='url(./images2/Buttons/intern_no.jpg)'
  break;  
 case "link_Sport_id":
  var url ='url(./images2/Buttons/Sport_no.jpg)'
  break; 
case "link_Haus_id":
  var url ='url(./images2/Buttons/Haus_no.jpg)'
  break; 
case "test2_id":
  var url ='url(./images2/Buttons/login_no.jpg)'
  break; 
case "intern_newpass_link_id":
  var url ='url(./images2/Buttons/lostpass_no.jpg)'
  break;
case "intern_register_link_id":
  var url ='url(./images2/Buttons/register_no.jpg)'
  break; 
case "link_weu_zurueck_id":
  var url ='url(./images2/Buttons/zurueck_no.jpg)'
  break; 
case "link_weu_prinzipien_id":
  var url ='url(./images2/Buttons/prinzipien_no.jpg)'
  break; 
case "link_weu_aktivenvorstand_id":
  var url ='url(./images2/Buttons/vorstand_no.jpg)'
  break;
case "link_weu_vorneu_id":
  var url ='url(./images2/Buttons/vorstandneu_no.jpg)'
  break;    
   case "link_aktivitaeten_id":
  var url ='url(./images2/Buttons/aktivitaeten_no.jpg)'
  break;       
 }
document.getElementById(a).style.backgroundImage = url;
}