function addComboboxItem(aList, aText, aValue, aSelect) {
    //var aOption = new Option(aText, aValue);
    //eval("aList.options[aList.options.length]=aOption");
	var op = document.createElement("OPTION");
			aList.options.add(op);
			op.value = aValue;
			op.innerText = aText;
			if (aValue == aSelect) {
				op.selected = true;
			} else {
				op.selected = false;
			}

}

function deleteAllComboboxItem(aList) {
  for (var i=aList.options.length; i > -1; i--)
      aList.options[i] = null;
}