Forum:Uploading Images !!!Help!!!

Whenever I try to upload a image to a wiki (in this case the Calvin and Hobbes wiki) I get a large white box on my screen, I assume that this is the screen for uplaoding images, but it never loads, it simply remains blank and I can't do anything with it. Do I need some kind of program to get this to work? I have so many images to make my wiki better, please help!