There's some inconsistency in menu vs. key/mouse shortcut behavior on
http://www.skeedz.com/wallpaper.php.
Usually, right clicking on links and choosing "open in background window" does the same as holding [Ctrl] and [click]ing on the link. Not here.
Right click on an image and "Open in background window" opens the link in a new background window. Fine.
[Ctrl]&[Click] opens a new background window, but another new window appears in the foreground, loading the same link as the background window. Bad.
BTW: Noticed this with K-M 1.1a. I set the shortcut to open a new background window to [ctrl] and [left click], standard is [ctrl] and [right click] IIRC.