Startup Problem and fsck not repairing

I have the same problem as in this thread :
http://www.mac-help.com/forums/showthread.php?p=5788

But unfortunately after running the /sbin/fsck -fy code, it tells me that macintosh hd could not be repaired.

Here is the script it shows after entering the code:
**/dev/rdisk0s2
**Root file system
**Checking HFS Plus Volume.
**Checking Extents Overflow File.
**Checking Catalog File.
disk0s2: 0xe0030005 (UNDEFINED).
Invalid node structure
(4, 10608)
**Rebuilding Catalog B-tree.
disk0s2: 0xe0030005 (UNDEFINED).
disk0s2: 0xe0030005 (UNDEFINED).
disk0s2: 0xe0030003 (UNDEFINED).
**The volume Macintosh HD could not be repaired.
disk0s2: 0xe0030005 (UNDEFINED).
localhost:/root#



please help me! Thank you do much for any advice you are able to give.
Steph

Hello, you might want to check out DiskWarrior. http://www.alsoft.com/DiskWarrior/
Here's some more things that you can try.
http://support.apple.com/kb/TS1411