Lost iphoto 6 library

I have iphoto 6.0.6 and just tried importing some photos off a CD copied from a friend's Mac running Leopard. A box appeared saying the photos were not compatible with my iphoto version and I should update it but there are no iphoto updates when I check for them.
Then a box appeared saying do I want to upgrade my photos to the newer version and (foolishly) I clicked it and it took several minutes to 'convert' my library.
Now when I open iphoto there is nothing in it and it says I should update iphoto; but still there are no updates available.
My pictures folder has a iphoto6.library file (white) but I cant open it.
What I want to do is reconvert my pictures back to their original format. I do not want to upgrade the rest of my computer to Leopard.
Thanks in advance for any assistance.

Here is a recap TD's advice
Try these in order - from best option on down...
1. Do you have an up-to-date back up? If so, try copy the library6.iphoto file from the back up to the iPhoto Library allowing it to overwrite the damaged file.
2. Download iPhoto Library Manager and use its rebuild function. This will create a new library based on data in the albumdata.xml file. Not everything will be brought over - no slideshows, books or calendars, for instance - but it should get all your albums and keywords back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
3. If neither of these work then you'll need to create and populate a new library.
To create and populate a new iPhoto 6 library:
Note this will give you a working library with the same Rolls and pictures as before, however, you will lose your albums, keywords, modified versions, books, calendars etc.
Move the iPhoto Library to the desktop
Launch iPhoto. It will ask if you wish to create a new Library. Say Yes.
Go into the iPhoto Library on your desktop and find the Originals folder. From the Originals folder drag the individual Roll Folders to the iPhoto Window and it will recreate them in the new library.
When you're sure all is well you can delete the iPhoto Library on your desktop.
In the future, in addition to your usual back up routine, you might like to make a copy of the library6.iPhoto file whenever you have made changes to the library as protection against database corruption.
It appears that you may have misunderstood part of these instructions
When moving the iphoto6library file (a white icon with nothing apparently in it) onto the desktop and then back into iphoto a box comes up saying it's a unrecognized format. Whatever happened changed the format of the photos; they weren't corrupted.
There is nothing about moving the library6.iPhoto file and bringing it back into iPhoto - the library6.iPhoto file is a file within the iPhoto library that describes the iPhoto database and there is nothing you can (or should) do with it
To create a new iPhoto 6 library (Not to be confused with the library6.iPhoto file discussed above) you follow the instructions starting at 3.
Is there a system restore like in Windows to a previous date that might work?
Only if you have a backup to restore
I dont really want to buy ilife if I can avoid it but I will if its the only way to get my photos back (and yes I should have made a back up)
Purchasing a later version of iLife will not fix anything - your library is corrupted and you must fix that for things to work - there is nothing wrong with your iPhoto application
LN

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