UnbAddFormStatus function [JavaScript]

Event handler that adds mouse hover statusbar information about HTML forms'
submit buttons' target URL

function UnbAddFormStatus (event);

Remarks:

NOTE: There are several problems with this function:
* It doesn't correctly handle the base path on Firefox, but it does on Opera.
* It always shows the page's last form's action URL for all submit buttons on the page.
Maybe something from http://weblogs.asp.net/asmith/archive/2003/10/06/30744.aspx can help here.
TODO,FIXME

Implementation file: unb_lib/common.js, line 482