Simple Lotus Notes hide fieldb if item1 of checkbox fielda is selected

Web Form:
Two fields (fielda and fieldb)
Field a is a checkbox.
Need to hide fieldb based on fielda's value.
eg. If fielda = "Other" ,  show fieldb (fieldbOther) so that user can give us the Other value.
or Hide fieldb if fielda != "Other"  
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KTTKTTAuthor Commented:
Please be specific and detailed.  If I have to use JavaScript, please explain in detail as well. thx, Beginner
KTTKTTAuthor Commented:
found this onchange in help but not sure how to use it :
Sub Onchange(Source As Field)
  Dim ws As New NotesUIWorkspace
  Dim uidoc As NotesUIDocument
  Set uidoc = ws.CurrentDocument
  Call uidoc.FieldSetText("SubjectDisplay", _
End Sub
KTTKTTAuthor Commented:
More info:  Fieldb does not Refresh properly with the regular hidewhen formula.  
e.g. fielda = "Other" ;@true ; @false

If I hit f9 to refresh, the value of fielda goes to Null.
KTTKTTAuthor Commented:
Since I didn't get a response, closing.  Finding another alternative.

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KTTKTTAuthor Commented:
Really no acceptable solution, but this was the only way I could close the request after not getting a response.
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