function setfocus(){
  if(document.forms.length > 0){
    for(i=0;i<document.forms[0].length;++i){
        if(document.forms[0].elements[i].type == "text"){
           document.forms[0].elements[i].focus();
           return true;
        }
    }    
  }
  return true;
}

function change_bild1(img){
      document.bild1.src = img;
      return true;
}