function show1(){
  
  	
   document.getElementById("fernseher_b").style.visibility = "visible";
   document.getElementById("fernseher_a").style.visibility = "hidden";
   
}
function hide1 () {
  
    document.getElementById("fernseher_b").style.visibility = "hidden";
   document.getElementById("fernseher_a").style.visibility = "visible";
   
}
function show2(){
  
  	
   document.getElementById("fernseher_c").style.visibility = "visible";
   document.getElementById("fernseher_a").style.visibility = "hidden";
   
}
function hide2 () {
  
    document.getElementById("fernseher_c").style.visibility = "hidden";
   document.getElementById("fernseher_a").style.visibility = "visible";
   
}
function zoomWindow(theURL) { 
  /* externe Links werden per Javascript geöffnet. Target-attribut in xhtml1.0 strict unbekannt. */
  newwin = window.open(theURL,"zoom","width=730, height=600");
  newwin.focus();
}