var REG_EXP_EMAIL_CHECK = /\b[A-Za-z0-9._%-]+@[A-Za-z0-9._%-]+\.[A-Za-z0-9._%-]{2,4}\b/;
        var REG_EXP_EMAIL_CHECK2 = /([A-Za-z0-9._%-]{2,4})$/;
        var REG_EXP_EMAIL_CHECK3 = /^([A-Za-z0-9._%-]+@)/;
            function Validate()
            {
           var oEmail = document.DOT_EMAIL_FORM.Email.value;
            if(REG_EXP_EMAIL_CHECK.test(oEmail))
                {
                if (REG_EXP_EMAIL_CHECK2.test(oEmail))
                    {
                    if (REG_EXP_EMAIL_CHECK3.test(oEmail))
                        {
                        return true;
                        }
                        else return false;
                    }
                    else return false;
                }
                else return false;
            }
            function Validate_and_Submit()
            {
            if (Validate())
                {
document.DOT_EMAIL_FORM.submit();
                }
                else
                {
                alert('Not a valid email');
                }
}