Brakes problem

[Brettus]

I was having a tentative look at my rear brakes got the calliper off but when I tried to put it back this small piece fell off :pale:
http://www.brettnet.co.uk/gallery2/Tempupload/brakebit.jpg

Came from the front end of the pads but I just don't see where it should go back to
Any help much appreciated, feeling very stupid at the moment :oops:

[Brettus]

Sorted that one, no wonder I couldn't find a place for it to fit on the caliper, and matched the clean areas with the ends of the pads heh, it sits over the disc on the swing arm doh!