Can't eject disc from Superdrive

I installed Parallels 7 with my Windows XP disc, but since then my iMac is not acknowledging the fact that the disc is still inserted into it. SuperDrive is greyed out in the disk utility and there is no disc showing up in the finder either. Pressing the eject key on the keyboard does nothing.

Any ideas? Thanks for your time.

Oh my bad, I had to eject it through Windows. I just found it peculiar that it's not showing in Lion while Windows XP is running... Sorry about the thread!