[jQuery] TableSorter plug-in - custom sorting depending on direction?

[jQuery] TableSorter plug-in - custom sorting depending on direction?


Here is my page: http://www.doheth.co.uk/db/world/country
If you sort some columns (eg GDP) you will notice the "blank" values
appear at the top. However, I want them to appear at the bottom.
Initially I created a parser which set the value to Number.MAX_VALUE
if it was '-'.
But this moves the blank entries to the top when sorting in descending
order. Is it possible to always have these at the bottom? Is it
possible to detect the sort order inside my parser?