function checkform ( form )
{

  if (form.name.value == "") {
    alert( "Please insert Name !!" );
    form.name.focus();
    return false ;
  }

  if (form.company.value == "") {
    alert( "Please insert Company !!" );
    form.company.focus();
    return false ;
  }

  if (form.tel.value == "") {
    alert( "Please insert Telephone !!" );
    form.tel.focus();
    return false ;
  }

  if (form.email.value == "") {
    alert( "Please insert E-mail !!" );
    form.email.focus();
    return false ;
  }

  if (form.comment.value == "") {
    alert( "Please insert Additional Comment !!" );
    form.comment.focus();
    return false ;
  }

  return true ;
}