Instead of this in your html:
onclick="javascript:Mon_Select()"
just do this:
onclick="Mon_Select()"
The first one isn’t valid js code (only works in urls), the second one works.
EDIT Also, remove your id
attributes from your <labels>
as sanjeev suggests
Hope this helps, cheers
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solved How to properly enable/disable input boxes when a specific checkbox is checked/unchecked? [closed]