Converts string based values to boolean.

toBool.js

var toBool = function(value) {
	switch (value.toLowerCase()) {
		case "true":
		case "yes":
		case "y":
		case "o":
		case "off":
		case "1":
			return true;
		case "false":
		case "no":
		case "n":
		case "x":
		case "on":
		case "0":
		case "-1":
		case null:
			return false;
		default:
			return Boolean(value);
	}
};