Reguarding your update, I opened the "Error Console" in the "Tools" menu in Firefox and it showed the following error:

Error: twofastest has no properties
Source File: http://defiant.i2r.a-star.edu.sg/~ewijaya/MotifVoter/cgi-
+bin/mv_dispatch_js.cgi
Line: 37
[download]

Looks like variable twofastest doesn't contain what it should. With simple backtracking, we see that
variable twofastest is null, because
document.getElementById('2 Fastest'); returns null, because
there is no element with id 2 Fastest.

USE THE ERROR CONSOLE!