[Coda]

In Safari on Mac, the "Show Cookies" command in the preferences has a search field. Just type "trisphee" in there. Firefox on Mac has a "Remove Individual Cookies" option in the Privacy section, also with a search field. In Opera, on Mac, Tools -> Advanced -> Cookies works that way as well. I assume there are equivalent functions in the Windows versions.

In Internet Explorer I don't believe there's any convenient way to do it short of opening the Temporary Internet Files folder (there's a button to pull this up in the settings window) and sifting through the entire list to find them.