namespacing callbacks

gistfile1.js

function exeCallback(callback, params) {
	var context = window,
			namespaces = callback.split('.'),
			func = namespaces.pop();
		
	for (var i = 0, l = namespaces.length; i < l; i++) {
		context = context[namespaces[i]];
	}
	context[func].apply(context, params);
}