You didn't need to write all that.
I significantly reduced the amounts of steps by:
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Part ONE
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Add the following CSS to the extra CSS definitions:
Code:
/* Forumdisplay Threadbit TD */
.alt3 {
background:#f8f7f2;
color:#000000;
border-top:0px solid grey;
border-right:0;
border-bottom:1px solid grey;
border-left:0;
}
.alt4 {
background:#f8f7f2;
color:#000000;
border-top:0px solid grey;
border-right:0;
border-bottom:1px solid grey;
border-left:0;
}
(Notice I replaced top:1px with top:0px and bottom:0px with bottom:1px! It tends to looks better

)
(P.S. Replace grey and #f8f7f2 with a color that matches your forum.)
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Part TWO
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And then I went to "All Style Options" and change the "Inner Border Width (pixels)" to "0".
After that, I created two style replacement variables.
Quote:
1. Search: class="alt1"
Replace: class="alt3"
2. Search: class="alt2"
Replace: class="alt4"
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END
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And... Tada! Less work, very clean, less load, no tables.
Thanks for helping me! ^.^