Email Validation in Javascript

function emailValidate(obj) {   
var reg = /^(?!\.)+([\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+\.)*[\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+@[\w\!\#$\%\&\'\*\+\-\/\=\?\^\`{\|\}\~]+(\.[a-zA-Z0-9-]+)*(\.[a-zA-Z]{2,3})$/;
    var address = document.getElementById(obj).value;
    if (reg.test(address) == false) {
        return false;
    }
    return true;
}