I have used VBScript in a spreadsheet to perform various functions btu im a
little confused as tohow to do the following:

On one of my userforms, i have two checkboxes eith or both of which can be
selected.  

If none are selected I have a message box pop up to say "Please select an
option" but when I press OK the userform closes.  How fo I get it to return
to the userform so that the user can select a checkbox and try again.

Any help would be appreciated

Sean