<FORM NAME="election">
<SELECT NAME="presidents">
<OPTION NAME="leaving">Al Gore
<OPTION SELECTED>George W. Bush
</SELECT>   
<INPUT TYPE="button" VALUE="Switch first option" onclick="switchEntries()">
</FORM>
<SCRIPT LANGUAGE="JavaScript">
<!--
function switchEntries() {
  if (document.all) {
    document.election.presidents.item(0).text = 'Bill Clinton';
  }
  else if (document.layers) {
         document.election.presidents[0].text = 'Bill Clinton';
       }
       else if (document.getElementById) {
              document.election.leaving.text = 'Bill Clinton';
            }
}
// -->
</SCRIPT>

Click the button below and see how the first option is changing on the fly:

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