Help needed - can't get back into OSX on MacBook

[Pauluncy]

Ok, so I winted to install a different copy of XP on my dual booting MacBook, so I brazenly chucked away all the files on the Windows partition and restarted with an XP disk in. It told me it wasn't a bootable drive and got stuck there. I finally got the disk out and rebooted (hoping to see OS X again). Now all i get is the message

NTLDR is missing
Press any ket to continue.

SO it's booting into windows, not finding a bootable drive and gettgins stuck there. Anyone know how I can get out of WIndows and back to OS X - I've tried restarting with the ALT key held down, but that doesn't help.

Any advice much appreciated.

PAUL

 

[waremaster]

Restart holding the Option key and you will get a menu.