JGOFS Data System images by program:
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program      name of image file     description
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dir          helpb.gif		    button to Help document
dir          homeb.gif		    button to organization's Home Page
dir          youhere.gif            points to directory being listed currently
info         datadisp.gif           a button back to data display,
                                        "Data display..."
info         dir.gif                see below
outer        dir.gif                button back to directory, "Directory..."
outer        doc.gif                button to metadata, "Documentation"
outer        more.gif               button to more utilities,
                                        "Plotting and Other Operations..."
outer        level0.gif             button to display Level 0 data, "Level 0"
outer        leveln.gif             button to display next level data, 
                                        "Next level"
outer        flat.gif               button to display current listing
                                        in flat format, "Flat listing"