Custom Profile Field - Changing value attribute?

[MarkPW]

I would like to add a custom user field so that my users can specify in what country they originate.

The problem is, I need to be able to set the value attributes of the option tags instead of using the number values that are automatically generated from a "select box" custom field in vb.

For example, at the moment I get:

<option value="1" selected="selected">Afghanistan</option>
<option value="2" >Albania</option> ...and so on..

What I want is (notice the custom value attribute):

<option value="AF" selected="selected">Afghanistan</option>
<option value="AL" >Albania</option>

Is there anyway to do this?

Thanks for any help