"eternal" ajax-checking with jquery

//I saw it in a Paul Irish's video
//http://net.tutsplus.com/tutorials/javascript-ajax/10-things-i-learned-from-the-jquery-source/
 
//Similar to setInterval, but with more performance :P
 
(function loopAjaxFunction(){
 
    doStuff();//We can stop here the loop... or not
 
    $("#update").load("checkmsgs.php", function(){
        loopAjaxFunction();
    });
})();