// JavaScript Document
function StringTools() {
}
// static methods:
StringTools.isEmail = function(str) {

	var re = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/;
	return re.test(str);
}