function checkInput(inp) {
  noerrors = true;
  if (inp.elements["name"].value=="") {
    alert("Please enter your name.");
    inp.elements["name"].focus();
    inp.elements["name"].select();
    noerrors = false;
  }
  if (inp.elements["email"].value=="" && inp.elements["telephone"].value=="") {
    alert("Please enter your email or a telephone number.");
    if (inp.elements["email"].value=="") {
    inp.elements["email"].focus();
    inp.elements["email"].select();
    } else {
    inp.elements["telephone"].focus();
    inp.elements["telephone"].select();
    }
    noerrors = false;
  }
  if (inp.elements["enquiry"].value=="") {
    alert("Please enter something you'd like to ask us!");
    inp.elements["enquiry"].focus();
    inp.elements["enquiry"].select();
    noerrors = false;
  }
  return noerrors;
}