Sql Server reporting services(2012)

Question

Hi Everyone

 

I was wondering the below problem. Can any one help me.

 

In My Reporting services i have 1000 Records and i want to give custom paging  with two text box present their. If I select from 1 to 20 it will display 20 record if i will select 1 to 40 it will display 40 records perpage.

 

Thanks In Advance