Overlay text onto a previous slide

We are dealing with an already completed project (in DirectRT 2006) but we want to modify it slightly. We are performing a discrimination task and want to change the correct/incorrect screen to include the previous slide. Any suggestions on how to alter the images (e.g. setting the correct/incorrect backgroudns on the previous slide)?

Yes, you could possibly do this with compound screen (see user's guide) but the correct/incorrect feedback would have to be included on the trial and not as jumps at the end of the input file.