//alert('test');
function clearOption (id, start, end) {
    var i, end, obj;
    obj = document.getElementById(id);
    
    if (end==-1) {
        end = obj.options.length;
    }
    
/* Clear out the current options */
    if (end>1) {
        for (i = start; i < end; i++) {
            obj.options[obj.options.length-1] = null;
        }
    }
}
function addOption(id, text, value)
{
  var elOptNew = document.createElement('option');
  elOptNew.text = text;
  elOptNew.value = value;
  var elSel = document.getElementById(id);
  try {
    elSel.add(elOptNew, null); // standards compliant; doesn't work in IE
  }
  catch(ex) {
    elSel.add(elOptNew); // IE only
  }
}