I assume TS is referring to the option on post.asp.
If so then look for the following select statement beginning on line 251 of that file:select case strSelectSize
case "1"
intCols = 45
intRows = 11
case "2"
intCols = 70
intRows = 12
case "3"
intCols = 90
intRows = 12
case "4"
intCols = 130
intRows = 15
case else
intCols = 70
intRows = 12
end select
and change the values in the last case - highlighted in green above - to match those of one of the other cases above where 1 is 640*480, 2 is 800*600, 3 is 1024*768 and 4 is 1280*1024.