He told me he's using a screen magnifier. I know there's the option of a styleswitcher, that's what I'm using on the rest of my site, but there are some thing you can't change with it. For example, the size of the thumbnails...well technically I could, but the quality won't be so good.
If you ever come up with a way to implement multiple installs please let me know as I'm quite interested in it.