File Upload Question

I am trying to create a script that will allow a user to upload images. For some reason the server requires both the write and execute properties on the directory to be set in order for the image to uploaded and displayed. I don't understand why the execute method needs to be set, since I don't want anyone to be able to run anything from that directory. Any suggestions would be appreciated. I know the system is Unix, but I don't know any of the specifics since it is run off of a hosting service. _______________________________________________________