Build callback chains without ridiculous indentation!

Chainer

function chainer(){
	var chain = [];
	function add(callback) { chain.push(callback); }
	function next() { if (chain.length) { chain[0](); chain.shift(); } }
	return { add: add, push: add, run: next, start: next, next: next };
}

// Make a new chain.
var chain = new chainer();

// Add a function
chain.add(function(){
	console.log('First!');
	chain.next();
});

// Add a function
chain.add(function(){
	console.log('Second!');
});

chain.run();