scorebar

[Elizabeth Smith]

I have a probabilistic learning task where I need a scorebar on the side 
of the screen to go up when the subject gets a correct answer and down 
when it is incorrect.  I found a sample of a scorebar program online, 
but its not really what I'm looking for.  Basically I have two images.  
A vertical line and a smaller horizontal line.  I'm wondering if there 
is a way to get the small horizontal line image to move up for correct 
answers and down for incorrect answers and to stay in that position 
until the next trial.  So the movement is cumulative. 

Any thoughts/ideas would be greatly appreciated.  I'm not great at 
programming and I'm a bit stuck on this problem.

Thanks!

-- 
Elizabeth Smith
Farah Lab
Center for Cognitive Neuroscience
University of Pennsylvania
215.573.8534 (office)
215.275.5474 (cell)