How to convert a threshold area to a selection?

Dear Users,

If I specifiy a threshold value ( with Image->Adjust->Threshold )How can 
I convert the threshold area to a selection afterwards? I can't see how 
to do this with ImageJ. Or does someone knows a plugin in which you can 
specify a lower and an upper threshold to form a selection?

Thanks in advance,

Hugo Gratama van Andel


--
Hugo Gratama van Andel - MSc
Academic Medical Centre - University of Amsterdam
Dept. Medical Physics      L0-152
Meibergdreef 9
1105 AZ Amsterdam
The Netherlands
Phone  :  +31 20 566 5206
FAX    :  +31 20 691 7233
e-mail :  h.a.gratamavanandel@xxxxxxxxxx