function validate_email_for_email_submission_page(field,alerttxt)
{
    with (field)
    {
    apos=value.indexOf("@");
    dotpos=value.lastIndexOf(".");
    if (apos<1||dotpos-apos<2) 
      {alert(alerttxt);return false;}
    else {return true;}
    }
}

function validate_email_submissin_form(thisform)
{
    with (thisform)
    {
    if (validate_email_for_email_submission_page(customer_email,"Not a valid e-mail address!")==false)
      {customer_email.focus();return false;}
    return true;
    }
}