[peugeot405]

If I understood correctly you want the gray section you see in the pic threadbit1 but then over the full lenght like in pic threadbit2

Attachment 145617

Attachment 145618

note: I used a different color to show what section is meant.

with the original color it wold like the pic threadbit3.

Attachment 145619

The code is following:

.threadbit .alt {
    background: none;
}
.threadbit .nonsticky, .threadbit .discussionrow {
    background: url("images/gradients/grey-up.png") repeat-x scroll left bottom #F2F6F8;
}