function validate_email(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_required(field,alerttxt)
{
  with (field)
  {
    if (value==null||value=="")
    {alert(alerttxt);return false}
    else
    {return true}
  }
}