waitbar with ETA, Estimated Time of Arrival...
Usage: h=timedwaitbar(fraction_complete[,infostring])
Fraction: is a number between 0 and 1. a value of 1 means completed and closes the window.
h: window handle.

some nice features:
* Estimates how much time before completion.
* Automatically open and close the waitbar window.
- It closes the window when fraction reaches 1
* You can abort the program by closing the progressbar

example use:

for ii=1:1000
timedwaitbar(ii/1000)
q=isprime(ii+1000:10000);
end