To resize pics you need a photoediting tool. If you don't have one (like Photoshop), upload your pics on imageshack.us wich will create thumbs for you
For now I just removed the IMG tags (the third solution if you can't post smaller pics

)
BTW, I strongly suggest to always "refine" your pics with PS.. it can seems a waste of time, but the pics can always be improved from the way they come out of the camera

But of course if you have no time for that, go the imageshack way and it will be perfect.