Mike,
Unfortunately, you can't specify image dimensions when posting pictures.
The images will only show up in their native dimensions.
HOWEVER, the good news is that our photo gallery will do some resizing for you. The site will A) create a thumbnail of your image, B) resize it so it shows on the screen without overlapping when people view the gallery, and C) save it in its regular size, the way it was uploaded.
I saved your picture to my hard drive, then uploaded it to your gallery. Here's what we have now:
