finally i have come to the conclusion that in the pagination class exists a bug.
details are here http://ellislab.com/forums/viewthread/57297/
short description:
so lets imagine i have 3 pages
when i’m on the first page i see “NEXT” navigation:
1 2 3 >>
but when i’m on the last page i do not see “PREVIOUS” navigation
do not see << here 1 2 3
it is meaningless .... or should be shown and >> and << or shouldnt be shown any of them and just pagination ....