Can't align images.

WP ignores the alignment of images.

For example, the image of the “help” laptop is supposed to align on the right:
http://probusiness101.com/2010/12/how-to-start-a-computer-repair-business/

There must be some code in my stylesheet that’s doing this.

These are the only two references to images in the stylesheet:

a img {
  border: none;
  }

.postContent img {
  margin: 5px;
  border: 1px solid #CCC;
  }