[S] Plot with confidence interval

[jxs@dor.kaiser.org]

     Hello,
     Does anyone have a function to plot mean and confidence interval by group. 
     The plot is something like the following:
     
     |          _       _  _
     |       _  |    _  |  |
     |    _  |  C    |  B  C
     |    |  B  |    A  |  |
     |    A  |  _    |  _  _
     |    |  _       _
     |    _
     __________________________
     group 1    group 2
     
     There could be more than two groups.
     
     Thanks for any help.
     
     Jun


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