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">?