The pop-up below has a series of values from 0 to 3, each corresponding to the numbers in the Slave Image. All the necessary JavaScript is now handled by the Pop-Up Slaves Action which should trigger the slave image when an option is selected. You WILL experience JavaScript errors if the values in the pop-up passed are not numeric. A value of -1 will reset the image. Select the pop-up and look at the Inspector Palette to see how this is set up.