PY is correct you need to downsize the photos.

Where are you trying to load them - here on your own photo album?

Anyow I resize to \\

the above photo is 448 x 338 pixels

good size to use is (480 x 640 pixels)
as seen below


here is Large (768 x 1024)


and when you use original the size gets to big so it is not seen properly when someone views your thread.

Original
(1536 x 2048)


Note: I use Flickr and have my own photo account - they have a tool on there to downsize but I am willing to bet so does Photobucket.

Lookk under any Tool section and Resize or Size tools

JW