[xwiki-users] can't save values on a form

I need to edit the registration form. I have altered the class XWikiUsers to add the extra fields I have altered the registration page to show the extra fields. However, the values are not being saved - when you create test users, log in and go to their profiles or edit/profiles the fields are blank HOw do I get the values to actually save? Here is some of the code from the registration page that I have used function doAction(){ document.getElementById('register_firstName').value = document.getElementById('first_name').value; document.getElementById('register_lastName').value = document.getElementById('last_name').value; } <dl id="xwikiuserprofile"> : : <dt class="label"><label>Title:</label></dt> <dd><input size='30' id='title2' name='title2' type='text'/></dd> : : the name for the property is title2