[jQuery] selector, second to last row of table

[theprodigy]

I've been trying for a while to alter the second to last row of a
table. I've tried several ways. The number of rows is dynamic so I
can't hard code a number into nth-child. I used $rowNeeded =
$thisRow.parents('table:first').children().children().length - 1 to
get the second to last row, but it doesn't seem like I can pass this
variable into nth-child either.

How can I select the second to last row of a table?

Thanks