textview: how to scroll like page up/ page down?

[kyanh <kyanh o2 pl>]

hi all,

i want to implement a function that can scroll the text view so that the 
result is similar to the case when user presses Page Up/ Page Down. I 
found that there's no any (single) function in Gtk2.4+ could help me do 
that.

is there any alternative?

thank you very much for replies.

regards,

kyanh