Small question on IE favorites

When I put a site into my favorites, it usually has a little custom icon to the left of it, but after a day or two, it gets replaced by the IE icon.

I actually like the custom icons, they make it much easier for me to find the right item in the list.

Anyone know how to get them back (and stay)?

(If I haven’t explained this well, here is an example - I have the United Airlines site in my favorites, and it used to have the United logo next to it in the drop down list. Now it has the blue “e” over the piece of paper that is the Internet Explorer icon.)

There are instructions on how to do this near the bottom of this page.