function getSelectedOption(lb1_id)
{
 var lb1 = document.getElementById(lb1_id);
 for(var i=0;i<lb1.length;i++)
   if (lb1.options[i].selected) return lb1.options[i];
 return null;
}

function addOption(lb2_id, selOpt)
{
 var lb2 = document.getElementById(lb2_id);
 var opt = document.CreateElement("option");
 opt.text = selOpt.text;
 opt.value = selopt.value;
 lb2.add(opt);
}

function removeSelectedOption(lb1_id)
{
 var lb1 = document.getElementById(lb1_id);
 for(var i=0;i<lb1.length;i++)
   if (lb1.options[i].selected) 
   {
       return lb1.remove(i);
       break;
   }
}