var ExecQueue = function() {
	this.queue = [];
};
ExecQueue.prototype = {
	add : function(fn, args, time) {
		this.queue.push( {
			fn : fn,
			args : args,
			time : time
		});
	},
	exec : function() {
		var delay = 0;
		for ( var i = 0; i < this.queue.length; i++) {
			var _this=this;
			var f=function(idx){
				return function(){
				_this.queue[idx].fn.apply(_this,_this.queue[idx].args);
				}
			}(i);
			setTimeout(f, delay);
			delay += this.queue[i].time;
		}
	}
}

function a(){
	alert('a');
}
function b(i){
	alert('b'+i);
}
function c(i,j){
	alert('c'+i+j);
}
var execqueue=new ExecQueue();
execqueue.add(a,[],5000);
execqueue.add(b,['i'],5000);
execqueue.add(c,['c1','c2'],5000);
execqueue.add(c,['c3','c4'],2000);
execqueue.exec();