How to cycle through siblings using jQuery?

Answer 1

how about this.

...
var selected = $(".selected").removeClass("selected");
if (jQuery(selected).next().addClass("selected").length == 0
   {jQuery(selected).siblings().first().addClass("selected");};
...

In old good AI manner you try to do the deed (addClass), if it worked (length <> 0) nothing more to do, otherwise you try again on the first of the siblings.