If you set the metadata properties close to true (closed:'true') and after centering it on window you call: $('#[yourContainerPlus]').mb_open(); it should fade out.

Hmm I can't seem to get it to start as closed. Does it need something to close into to? I did get the fadein to work using jquery's standard .fadeIn('slow') which I just learned how to use.

Thanks for the tip I'll keep trying your way I might just have made a dumb mistake:

$(".containerPlus").buildContainers({ containment:"document", elementsPath:"/sites/all/themes/zen/usrabook/elements/", mantainOnWindow:false, closed:"true" });

$(".containerPlus").mb_centerOnWindow();

$(".containerPlus").mb_open();