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hey scrapie,
adjust this:
td#leftcolumn div.blockContent {padding: 2px 0px 2px 3px; line-height: 110%; padding-left: 15px;
font-size:20px;} in the above you also have padding-left set to 15px, this is compromising your right border in left blocks.
note: line heights are defined diff for left and right columns.
and i also noted font-sizes are defined in %,px, and smaller etc. not all browsers like %s.