Prevent Checkbox2 being Selected if Checkbox1 is Selected

Is there a way to control if 1 checkbox is selected, then another specific checkbox cannot be selected.

a) If checkbox1 is selected (= "true"), checkbox 15 cannot be selected (= "true").
b) if Checkbox15 is selected (="true") Checkbox1 cannot be selected (="true")

Both Checkboxes run code when they are unselected (= "false")

Thanks,

Here is code for checkbox1:

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Here is code for checkbox15:

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How would you like an error to be handled?
-A message box pops up informing the user that they cannot select TRUE for both Checkboxes
-If Checkbox1 is selected TRUE, then the user selects Checkbox15 as TRUE also, it will automatically unselect Checkbox1 (and vice versa)

BigBas,
I would like to prevent them from selecting true for both checkboxes.

AND
"A message box pops up informing the user that they cannot select TRUE for both Checkboxes"


Thanks,

I didn't have a chance to check this, so report back if it doesn't work:

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Works perfectly,

Thank You.