Topic: One image at a time


Can any one here please let me know what parameters I have to set / add to the script / .as file so I can have only one image at a time on the screen. I have have different size images, some are wide and some are tall and when a tall image is displayed the movie displays the edges of the  other images at both sides. I want to have only one image to be displayed at one time of either size.

I had used the upscale property and its managing the height but the issue am facing is related to width ? or any other solution ?