Callback method:

function allDone(){
// This piece of code will be executed
// after element1 and element2 is complete.
}

function callbackTrack(d){
callbackTrack.queue = callbackTrack.queue || [false];
if (d === ‘done’){
if(callbackTrack.queue.shift() && callbackTrack.queue.length == 1) allDone();
return;
}
callbackTrack.queue.push(true);
return function(){ callbackTrack(’done’); }
}

$(”#element1″).slideDown(500,callbackTrack());
$(”#element2″).slideDown(700,callbackTrack());