Millisecond Forums

I have 600 Pictures (flowers and Spiders) and would like to Display each 2 Pictures simultaneously, side by side, the participant then should choose one of them with either the L or A key. I cannot seem to figure out how to put all the Pictures in Inquisit.Also I would like to put in a Video before presenting the Stimuli but Inquisit keeps telling me it is unable to open the file (although I saved it as a .wmv file)