How to get output of multiple asynchronous calls in one callback.

everythingatonce.js

function getGroupCallBackGenerator(timeOut,finalCallback){
     			var waitingStatus={};
	   			var resultObject={};
	   			var started=false;
	   			var timedOut=false;
	   			var timer=setTimeout(function(){
	   				timedOut=true;
	   				if(typeof(finalCallback)=="function"){
	   						finalCallback(resultObject);
	   				}
	   				timer=false;
	   			},timeOut);

	   			function isAllDone(){
	   				for(var ins in waitingStatus){
	   					if(waitingStatus.hasOwnProperty(ins)){
	   						if(waitingStatus[ins]){
	   							return false;;
	   						}
	   					}
	   				}
	   				return true;
	   			}
	   			function tryToTriggerFinalCallback(){
	   				if(!isAllDone()){
	   					return;
	   				}
	   				if(timedOut){
	   					return;
	   				}
	   				if(!started){
	   					return;
	   				}
	   				if(typeof(finalCallback)=="function"){
	   					if(timer){
	   						clearTimeout(timer);
	   						timer=false;
	   					}
	   					finalCallback(resultObject);
	   				}
	   			}
	   			return {
	   					'getCallback':function (instanceName){
	   						if(waitingStatus[instanceName]!==undefined){
	   							throw "Duplicate Instance Name, While Generating the Callback...";
	   						}
			   				waitingStatus[instanceName]=true;
			   				return function(r){
			   					resultObject[instanceName]=r||{};
			   					waitingStatus[instanceName]=false;
			   					tryToTriggerFinalCallback();
			   				}
			   			},
			   			'start':function (){
			   				started=true;
			   				tryToTriggerFinalCallback();
			   			},
			   			'abort':function(){
			   				started=false;
			   			}
	   			}
}