Hi Baldur2630,
In regards to your second post .... (custom field) ..... would this work for you ....
Code for drop down .....
<select name="xOperating System" tabindex="?" value="(%INPUT_xOperatingSystem%)">
<option selected="selected">--please select--</option>
<option>Windows</option>
<option>Linux</option>
<option>NetWare</option>
<option>UNIX</option>
<option>Other</option>
</select>
Code to make it a mandatory field
<input type=hidden name=mandatory value="xOperating System">