Название<br>поля <select name="f23">

Region Footer

<script language="JavaScript" type="text/javascript">
<!--

var objSel = document.getElementById("f23");
var oOption = document.createElement("Option");
  oOption.appendChild(document.createTextNode('тект'));
  oOption.setAttribute("value", 'знач');
objSel.appendChild(oOption);

//-->
</script>

BEGIN
  HTP.p('<script type="text/javascript">');
  HTP.p('alert();');
  HTP.p('var objSel = document.getElementById("f23");');
  HTP.p('var oOption = document.createElement("Option");');
  HTP.p('oOption.appendChild(document.createTextNode("тект"));');
  HTP.p('oOption.setAttribute("value", "знач");' );
  HTP.p('objSel.appendChild(oOption);' );
  HTP.p('</script>');
END;

Process Point