Thread:Extension talk:HTMLets/Trouble relocating the htmlets directory

I've had the extension working with the htmlets directory located in the default location under the "wiki" directory. Wanted to move the htmlets directory to the root of my server so I can open up ftp directories without giving access to the htmlets directory. Entered the following in localsettings.php:

$wgHTMLetsDirectory = "http://localhost/htmlets/";

Used ?action=purge on the test page but still I get error message. Is there something very simple I'm overlooking (I'm new with all this stuff)?