Drop Downs?

[Mythotical]

<tr>

<td><select name="name" tableindex="1">

<option value="choice one">$post[musername]</option>

<option value="choice two">$post[field19]</option>

</select></td>

</tr>

Now how would I get it to display the field and username?

Also how would I get it to post the name for which they sent it from when they receive the PM?

Thanks in advance
Myth

Anyone at all?