Ive put up some pictures up and they keep loading up like this

http://i382.photobucket.com/albums/o...psfc61097e.jpg

Why has it started to do this?
Also before they start to upload like this the pictures where big when I upload on here. I know I can resize them but I don't know what size to put them as they seem all different. Is there a easier way to sort this?

thanks
lee