Any Help !! I need to filling in a dorp box on a web form here the code

<tr >
<td align="right" width="150" class="yregfieldtitle"><span class="yregasterisk">*</span>&nbsp;<LABEL for="sex" accesskey="G">Gender:</LABEL></td>
<td nowrap width="10"><spacer type="horizontal" width="10"></td>
<td align="left" width="560">
<select name=".sx"id="sex"><option value="">[Select]
<option value="m">
Male
<option value="f">
Female</select>
</td>


Iv tried WebBrowser1.Document.getElementById("sex").Value = M
and WebBrowser1.Document.getElementById(".sx").Value = M