Add image in body in email

hi,

i want to add logo in email body please advice i have this code, what to modify in it to add the logo

                Password = (string)dview.Table.Rows[0]["Password"];
                Panel1.RenderControl(hw);
                StringReader sr = new StringReader(sw.ToString());
                MailMessage mm = new MailMessage(Emailfrom.ToString(), BCC.ToString());
                mm.Subject = "Order from Nature's Mix Date:" + DateTime.Now.ToString("dd/MMM/yyyy");
                mm.Body = "Details:<hr />" + sw.ToString(); ;
                mm.IsBodyHtml = true;
                SmtpClient smtp = new SmtpClient();
                smtp.Host = SMTP.ToString();
                smtp.EnableSsl = false; ;
                System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
                NetworkCred.UserName = Emailfrom.ToString();
                NetworkCred.Password = Password.ToString();
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = NetworkCred;
                smtp.Port = 25;
                smtp.Send(mm);