dataScroller.jsf: How to reset pagindex

[Marcel Ruff]

Hi,

i need to reset the page index of
  994 Cars found, displaying 10 cars, from 1 to 10. Page 99 / 100

If i watch page 99 and program some filter so that after reload max page 
is only
20 the current page 99 is far behind the end.
How can i programmatically reset the current page to 0 ?

Thanks
Marcel