Hello. I'm trying to develop a theme where you can create an image for a module that will display when a site visitor goes to that specific mod. However, I'm trying to develop it so that you don't have to create images for those mods you don't want images for (for example, a 1px*1px spacer for each mod that doesn't have it's own image). So.. to the question...

How can i check to see whether an image file exists before putting the image on the page, so that if the file doesn't exist, i can put in something different, like a space?

thanks in advance!
-zimmi88 =)