function elm(id)
{
  return document.getElementById(id);
}

function validateAndSubmit()
{
  var company = elm('tfCompany').value;
  var email = elm('tfEmail').value;
  var phone = elm('tfPhone').value;
  var person = elm('tfPerson').value;
  var errorFree = true;
  
  if((!company)||(!email)||(!phone)||(!person))
    elm('errorMessage').style.display = 'block';
  else
    elm('contactForm').submit();

}