function validate ( form )
{

  if (form.name.value == "") {
    alert( "Please enter your name." );
    form.name.focus();
    return false ;
  }
  if (form.address.value == "") {
    alert( "Please enter your address." );
    form.address.focus();
    return false ;
  }
  if (form.email.value == "") {
    alert( "Please enter your E-mail." );
    form.email.focus();
    return false ;
  }
  if (form.tel.value == "") {
    alert( "Please enter your telephone number." );
    form.tel.focus();
    return false ;
  }
   if (form.enquiry.value == "") {
    alert( "Please enter your enquiry." );
    form.enquiry.focus();
    return false ;
  }

  return true ;
}