function checkForm() {
  FirstName = document.getElementById("FirstName").value;
  LastName = document.getElementById("LastName").value;
  Email = document.getElementById("Email").value;
 
  if (FirstName == "") {
  hideAllErrors();
document.getElementById("FirstNameError").style.display = "inline";
document.getElementById("FirstName").select();
document.getElementById("FirstName").focus();
  return false;
  
  } else if (LastName == "") {
hideAllErrors();
document.getElementById("LastNameError").style.display = "inline";
document.getElementById("LastName").select();
document.getElementById("LastName").focus();
  return false;
  
  } else if (Email == "") {
hideAllErrors();
document.getElementById("EmailError").style.display = "inline";
document.getElementById("Email").select();
document.getElementById("Email").focus();
  return false;
  }
  return true;
  }
 
  function hideAllErrors() {
document.getElementById("FirstNameError").style.display = "none"
document.getElementById("LastNameError").style.display = "none"
document.getElementById("EmailError").style.display = "none"
  }