Page Up/Page Down in Portals

[Carl Smith]

I have a file which shows 2 portals, Portal A and Portal B (3 files in total) and I want to be able to give 2 buttons to act as the Page Down and Page Up keys for Portal B so that I can scroll down to select a record to be transferred into Portal A.

The portal rows in Portal B show related records based on a parent key in the main file.

I want to show 10 lines in Portal B so that when the user clicks on the Page Down button the portal shows records 11-20, 21-30, etc. It must also stay showing the last portal row irrespective of the number of portal rows on the "last page". Similarly a Page Up button would work in the opposite direction.

Can anyone help?