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


function email_validation()
{
    if (validate_email(document.MyForm.Email,"Please enter a valid email address.")==false)
	{MyForm.Email.focus();
        return false;
    }

     return true;
}