Table spanning

hey, I know that most of us have better resolutions then 800x600 but I still want to design for that resolution. Well I have a table with like columns. I want the 5th column to expand the whole width of the extra screen. So depending on which resolution u had it still went all the way. i know you can do this with percents. Hoever how would I just do one cell, or do I have to do the whole table?

try an overall width of 100% for the table, but set absolute widths in pixels for the first 4 cells in the first row (say 160px each, if you want all 5 columns to look equal at 800 x 600px), and leave the last cell width undefined - that way the last cell of the row (and for all rows underneath) will fill the rest of the space at higher res