How to pre-select a select list?

Hi everybody,

I have a form for updating the user information in my application. This form is loaded when I click on an "update" link in my user information table.

The update form includes: username, password, and email fields, followed by a drop-down list of available user groups that the user can be part of (this list is dynamically generated from a table in DB). I easily pre-populate the text fields like this:

<html:text property="name" name="editinguser"/>

where "editinguser" is the name of the bean containing the user object information, stored in the session.

My problem is that I don't know how to pre-select the related user group in the combo-box. At present my code is:

<html:select property="groupid">
  <html:options collection="allUserGroups" property="groupid" labelProperty="groupname" />
  </html:select>

where allUserGroups is the collection containing the group objects. Now how can I make the groupid of "editinguser" be selected in allUserGroups combo-box?

TIA.