Migrate from MySQL to PostgreSQL

Hi! Im trying to migrate from MySQL 4.0 to PostgreSQL 7.3 I'm using PEAR::DB, so this will be no big problem. But how to get data and table-definitions to PostgreSQL? I have about 100 tables which have to be migrated. I tried to use MyODBC and pgAdmin2 migration Wizard, but this does not work (pgAdmin crashes). So I tried to change a mysqldump by myself, but this is very difficult and could cause problems which I perhaps don't see at once. So is there a better solution to migrate the table-definitions? I thougt about PEAR::MDB, is there a way to create an XML-table-definition for MDB, by MDB itself? I could not find any methodes which could do something like that. What could I do? Any ideas? kind regards, Andreas