Cookies to Delete Cookies to Keep

In Options>Cookies there is a list of cookies to Delete, but when I delete all cookies from Internet Explorer, Firefox and Navigator they are still in the list. Shouldn't they delete, or is there something I'm missing?

Could they be lurking somewhere I'm not aware of?

Appreciate some help.

:) Ahh, found a previous post with the answer. They were cookies added by Flash Player. Selecting Adobe Flash Player in Multimedia got rid of them.