function checkEmail(action) {
    var emailField = document.getElementById("emailAddr");
    emailValue = emailField.value;
    if(emailValue.length > 0)
    {
        if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(emailValue)){
            return true;
        }
        else
        {
            alert("Invalid E-mail Address! \nPlease re-enter in xyz@123.com format.")
            return false;
        }
    }
}