function valid(form) {
  if (form.fname.value=='') {
    alert("You must indicate your Name.");
    form.fname.style.backgroundColor='#F3DDD5';
    return false;
  }
  else { form.fname.style.backgroundColor=''; } 
  
if (form.city.value=='') {
    alert("You must indicate your City.");
    form.city.style.backgroundColor='#F3DDD5';
    return false;
  }
  else { form.city.style.backgroundColor=''; }

if (form.bemail.value=='') {
    alert("You must indicate your Email.");
    form.bemail.style.backgroundColor='#F3DDD5';
    return false;
  }
  else { form.bemail.style.backgroundColor=''; }


  return true;
}