function checkform ( form )
{

  // EMAIL contact form
  if (form.name.value == "") {
    alert( "Please enter your contact name." );
    form.name.focus();
    return false ;
  }  

  if (form.email.value == "") {
    alert( "Please enter your email address." );
    form.email.focus();
    return false ;
  }  
  
  if (form.message.value == "") {
    alert( "Please enter your message." );
    form.message.focus();
    return false ;
  }  
  
  if (form.code_post_text.value == "") {
    alert( "Please enter the security code as you see it in the image." );
    form.code_post_text.focus();
    return false ;
  }   

  // ** END **
  return true ;
}