function checkForm() {
fname = document.getElementById("fname").value;
lname = document.getElementById("lname").value;
phone = document.getElementById("phone").value;
  
if (fname == "") {
hideAllErrors();
document.getElementById("nameError").style.display = "inline";
document.getElementById("fname").select();
document.getElementById("fname").focus();
return false;
  } else if (lname == "") {
hideAllErrors();
document.getElementById("lnameError").style.display = "inline";
document.getElementById("lname").select();
document.getElementById("lname").focus();
return false;
  } else if (phone == "") {
hideAllErrors();
document.getElementById("phoneError").style.display = "inline";
document.getElementById("phone").select();
document.getElementById("phone").focus();
return false;
  } 
  return true;
   }
 
function hideAllErrors() {
document.getElementById("nameError").style.display = "none"
document.getElementById("lnameError").style.display = "none"
document.getElementById("phoneError").style.display = "none"
  }