function gensel()
{ 
 var s1=document.getElementById("sel1");
 var s2=document.getElementById("sel2");
 s2.length=0;
 for ( var n=0; n<liste[s1.selectedIndex].length; n++ )
 { 
  s2.length++;
  s2.options[s2.length-1].text=liste[s1.selectedIndex][n]; 
 } 
}