Constraining the pointer within a group

[DVGlasgow at aol.com]

I have been working on assessment tools for people with learning 
disabilities.  Sometimes they also have motor skills problems.  

I ask them to rate something using a scale made up of adjacent buttons which 
behave like radio buttons, but offers a bigger target.  Sometimes the act of 
clicking by users nudges the pointer off the button group so the mouseup is 
not registered.  Since I am timing responses, this is a real pain, to say 
nothing of the frustration caused to the user.

I am thinking of trying to constrain the pointer so it cannot move out of the 
rating scale area until a rating has been made.  Before I start to 
experiment, has anyone any suggestions or advice?

Thanks


Best wishes,

David Glasgow
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