Forum Moderators: mack
onChange="document.forms[0].elements[0].focus()"
This goes in the tag for the last field. Here's how it works:
onChange - specifies what to do when that field changes.
document.forms[0] - refers to the first form in the document (start counting from zero).
elements[0] - refers to the first field in the form.
focus() - this method gives the specified field the focus.