Hi Jackie,
How's this:
Just out of curiosity, have you read the
PL/SQL User's Guide and Reference?
I couldn't tell from your post which version of Oracle you are using, so I am assuming the latest version. Here is a link to the online version:
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96624/toc.htm Hope this helps.
Good Luck,
Avi.