This syntax works:
%width=800px%http://tl.5ko.fr/common/skins/thumblist/bg.jpg"Fabulous galleries" | Petko's awesome Thumblist and Mini recipes illustrated%%

This syntax did work until the hosting site kicksaholic.com blocked it (possibly to conserve band-width):
%%http://www.kicksaholic.com/wp-content/uploads/2008/03/converse-1hundred-scott-patt.jpg"cool shoe" | cool shoe%%

Why does this not display the image from the icon file?

    http://www.pmwiki.org/favicon.ico

    http://gnuzoo.org/avatar/favicon.ico

This syntax works:

Petko's awesome Thumblist and Mini recipes illustrated

This syntax did work until the hosting site kicksaholic.com blocked it (possibly to conserve band-width):

cool shoe

Why does this not display the image from the icon file?

    http://www.pmwiki.org/favicon.ico

    http://gnuzoo.org/avatar/favicon.ico