Sets the values of a javascript object or array using a chain of colon separated keys.

object-path.js

function set(obj, keyChain, value) {
	var keys = keyChain.split('.');
	var key = keys.shift();
	while(keys.length) {
		obj[key] = obj[key] || (isFinite(keys[0]) ? [] : {});
		obj = obj[key];
		key = keys.shift();
	}
	obj[key] = value;
}