Trouble importing large databases

I am writing functions to import a large CMS database to WP but I have trouble iterating the database. When iterating I will only get the first 99 iterations OK and the rest do not return any data.
I have made a fix so I start a new iteration cycle after 90 reads and it works but I have to klick a button each time to call admin.php for the next step.
The call is done from a form:

<form action=”admin.php?import=locms&step=9″ method=”post”>’

I have two questions.

1. How can I do more iterations when reading the database?
2. How can I call admin.php without using the button in the form?

Thanks in advance!

Gungmas