Importing class file in CI

[eluser]Sumon[/eluser]
[quote author="Computerzworld" date="1221813755"]ya i am facing this issue as sumon has said...
i tried to include my class in CI as library but as soon as I included it the page goes blank...[/quote]
from my experience this is always tough to find out the problem when there are no warning or error but the page is blank. however, i found two situations where the page display blank. First when there is an include file name and the file path or file name is incorrect. and secondly when there is php 5 coding(use of static variable or etc) and the server version is 4. These are from my non CI development experience.