Migration from MySQL to PostgreSQL : Datatypes?

Hello,

What would be the best way to deal with migrating a database structure and data from a mysql db to postgres when there are dataypes in the mysql tables that are not present, and thus throw errors using the current migration wizard, in postgres?

If i leave these few tables out on first import, many of the other tables that these few key back to dont get created either.

I found a program called easyfrom, but it's over $200 and only runs on windows. Navicat, which i have, doesnt seem to have any provision to change the datatypes on structure sync from one to the other types of db.

Any suggestions would be great.
thanks.