changing a column's position in table, how do you do that

Is there a way to change the position attribute of a column in a table? 
I have data that I need to import into various tables in my db on a 
consistent basis... I usually us e the COPY ... FROM query but I can't 
control the -order- of the fields my client dumps the data so I would 
like to be able to change the position the columns in my table to be 
able to better align the data to be imported with the format of my 
table. I was thinking I could do something like "ALTER TABLE ALTER 
COLUMN ... " or something like that to change the columns position in 
the table but I can't figure out how.

Ferindo