Customize Pagination class

[eluser]web_developer[/eluser]
Hello,

I want to customize Pagination class.

I have to show page link in range.. ($config['total_rows'])

For exmple like below

|<< << 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 >> >>|

if User go to page number 11 then link should be display 11 - 20

(In short need to display links in range)

1 - 10
11 - 20
21 - 30 and so on...

So for that what change required to do?