A simple JavaScript library for lazy loading JavaScript files

loader.js

var loader = (function() {
	var scripts = [];
	var dw = function(s) {
		document.write(s);
	};
	var ret = {
		add: function(src) {
			if(!scripts.indexOf(src)) {
				scripts.push(src);
			}
			return ret;
		},
		render: function() {
			while(scripts.length) {
				var src = scripts.pop();
				dw("<script type='text/javascript' src='" + src + "'></" + "script>");
			}
			return ret;
		},
		invoke: function(fn) {
			if(fn) {
				dw("<script type='text/javascript'>" + fn.toString() + "</" + "script>");
			}
			return ret;
		}
	};
	return ret;
})();