External hard drive can't be read on my Mac Book Pro

I have a had drive which is Mac OS formatted and it has always worked well with my Mac Book Pro but I had a program crash on me and I was working out of my hard drive. I force quited the program and tried to eject the hard drive but it seemed that program was still acessing the hard drive, I had not saved anything and nor did I want to and I didn't know how long whatever was happening would take, plus as far as I was concerned the program was closed, the windows were gone and my files closed, so I switched of my hard drive anyway. Now when I switch on the hard drive my Mac says it cannot read it and I don't know how to get it to read it again. I tried verify and repair and it says it can't stating. I don't know what to do and I desperately need acess to my hard drive. Can anyone please help?
The error message I recieve in Disk Utility in case it helps:
Verify and Repair volume "disk2s1"
Checking Journaled HFS Plus volume
Invalid B-tree node size
Volume check failed.
Error: Filesystem verify or repair failed
Message was edited by: teoni

Invalid B-tree node size
Volume check failed.
I'll expand on the last post a little.
Disk Utility cannot repair that error.
If Disk Utility can't fix it, you'll need a more robust utility for the repair. I would recommend DiskWarrior. It is the best at directory repairs. It rebuilds then actually replaces your old directory. I feel every Mac owner should have a copy. Make sure you get the disk so you can boot up on it to run repairs. You can also install it on another drive and run it from there to repair this one. DW works faster that way.
I use DW once a month to try and catch errors in my system from getting too far out of hand. It has repaired every little and big issue I have ever had with my three Macs.
If you have a good backup, hopefully a clone of your system before you had issues, an Erase and Install will also rid you of this issue. But, beware! You will lose everything on the drive with this procedure. Let us know if you need help with that!
Good Luck! DALE
p.s. Here's a rewiew of DiskWarrior 4.

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