function check_email()
{
        var emailAddress = document.getElementById("Email")
        if (emailAddress.value =='')
        {
        emailAddress.focus();
        alert('Please enter your email address.')
        return false;
        }

        if (emailAddress.value !='')
        {
                var valid = "."
                var valid2 = "@"
                var ok = "yes";
                var temp;
                
                temp = "" + emailAddress.value.substring(0,100);
                temp = temp.toLowerCase()
                
                        if (temp.indexOf(valid) == "-1") ok = "no";
                        if (temp.indexOf(valid2) == "-1") ok = "no";
                
                if (ok == "no") 
                {
                alert('Please enter a valid email address.');
                emailAddress.focus();
                emailAddress.select();
                return false;
                }
        }
//document.ListServ.submit();
}