Page Up and Page down functionality in table control

Hi,

I want to add two pushbuttons in the module pool screen which has a table control that fetches data from the transparent table. One pushbutton is for the page up and other is for page down. If my table control <say tab_ctrl1> has 75 records in total with shows 25 at time so with a single page down it should show next 25 rows of the data.

thanks

ekta