Boot camp partition fail

Hi,

I had partitioned my 320GB MacBook Pro Hard drive to temporarity run some windows based programs. (Ok. Games.) I designated 50GB to Windows and 270GB to OSX. I was done with windows so I decided to restore the partition via Boot Camp. However, halfway through I recieved an error that the partition could not be restored. Now, the windows disk has been erased (the Boot Camp drive icon is gone and I cannot access it through restarting my computer) however I still do not have the full 320 capacity on my disk. It still shows the capacity to be 270GB.

When I went into Boot Camp to try to restore the drive again, Boot Camp did not give me the option to delete windows, but just to parition remaining 270GB of my hard drive designated to OSX. How do I get back that 50GB?