function changeSrc(type, id, src, alt){
  iframe=document.getElementById(id);
  if(type=="bild"){
    img = new Image();
    img.src='content/angebote/pics/'+src;
    iframe.src='content/angebotdetail/showme.php?src='+src+'&alt='+alt;
    iframe.style.height=img.height+'px';
  }else if(type=="video"){
    iframe.src='http://www.youtube.com/embed/'+src+'?rel=0&autoplay=1';
    iframe.style.height=290+'px';
  }
}