I love the jQuery plugin architecture, however, I find it frustrating (probably due to a lack of understanding on my part) when I want to retain a reference to the plugin in
I think you could accomplish what you're looking for with something like this:
var myIcon = $("myId").ajaxIcon(); //myIcon = a reference to the ajaxIcon
$.ajaxIcon.start(myIcon);//some stuff
$.ajaxIcon.stop(myIcon);
Haven't tested it though - I don't have access to an environment where I can do that atm