Your problem is the ' instead of ".
This line:
print '<BR><INPUT TYPE="checkbox" NAME="checkbox"
      VALUE=$counter2>$labels[$counter2]';

[download]
should be 
print qq(<BR><INPUT TYPE="checkbox" NAME="checkbox"
      VALUE=$counter2>$labels[$counter2]);

[download]
q() or ' doesn't interpolate, whereas qq() or " does.

In reply to Re: Checkbox values by dondelelcaro
in thread Checkbox values by chriso

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