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

Error: checBoxClick is not defined
Source File: http://defiant.i2r.a-star.edu.sg/~ewijaya/MotifVoter/cgi-
+bin/mv_dispatch_js.cgi
Line: 1
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Guess what, you simply mistyped the function name :)

-onClick=>"checBoxClick()",
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should be

-onClick=>"checkBoxClick()",
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