function contactform() {

	valid = true;

  if(document.contact_form.who.value == "Trade" ||
  	 document.contact_form.who.value == "Journalist") {
  	
      if(document.contact_form.phone.value == "") {
      	alert ( "Please enter a phone number" );
      	valid = false;
      }
  }
  
	return valid;
}