function check_inquire_form(theForm){
  if(theForm.first_name.value == ''){
    alert('You must enter a first name.');
  
  }
  else if(theForm.last_name.value == ''){
    alert('You must enter a last name.');
  
  }
  else if(theForm.email.value == ''){
    alert('You must enter an e-mail address.');
  
  }
  else {
    theForm.submit();
  }
}