I can't think of a simple way to do this.
But one way is to create another table with the correct column order, and populate it with data from old the table.
A query like this will do it:
insert into newTable (Column Red, Column Blue, ColumnGreen) select (Column Red, Column Blue, ColumnGreen) from oldTable
Next, verify the integrity of the data in the new table, then drop old table, and finally rename new table to the proper name.
Richie.