function anpassen1(){
  //alert('begin'); 
//  alert(document.getElementById('ifir2r').style.height);
//  alert(ifir2r.document.getElementById('main_small_right'));
//  alert(ifir2r.document.getElementById('main').offsetHeight);  
//  alert(ifir2r.document.getElementById('main').offsetHeight + 'px');
//alert(document.getElementById('ifir2r'));
  //alert(ifir2r.document.getElementById('main_small_right'));
  document.getElementById('ifir2r').style.height = ifir2r.document.getElementById('main_small_right').offsetHeight + 'px';
  //alert('end');
}

function anpassen2(){
  document.getElementById('ifir2l').style.height = ifir2l.document.getElementById('main').offsetHeight + 'px';
}

function anpassen3(){
  document.getElementById('ifir1').style.height = ifir1.document.getElementById('main').offsetHeight + 'px';
}