ok la forma quedo de este modo: 
  Código HTML:
 <form action="dnc_erase.cfm" method="post">
  <select id="sel" onchange="verification1();">
    <option value="0">Select a partition</option>
<cfoutput query="dncgetpartitions">
    <option value="#librarypartitionid#">#NAME#</option>
</cfoutput> 
  </select>
 <div id="hiddentext" style="display: none;">
  <textarea name="comments" id="txtOther" cols="40" rows="5">
Enter the phone numbers here, separated by a comma. 
Example: 
9182736450,6142478087,etc
  </textarea><br>
  <script language="JavaScript">
 var name = document.getElementById('sel');
 var companyname = name.options[nombre.selectedIndex].text;
 </script>
 <input type="submit" value="Submit" OnClick="if (! (!confirm('Are you sure that you want to add these numbers to the DNC list for ' + companyname)) return false;" />
 </div>
</form>  Pero no me sale el confirm...se va directo a la pagina de proceso de datos (dnc_erase.cfm)......podria ser algo con los:   <script language="JavaScript">?