function validLoginEntries(form) {

  var userName = form.userName.value;
  var password = form.password.value;

  if(userName == "") {
    alert("You must enter your user name.");
    form.userName.focus();
    return false;
  }
  if(password == "" ) {
    alert("You must enter your password.");
    form.password.value = "";
    form.password.focus();
    return false;
  }
  var passwordRegex = /^[a-zA-Z0-9]+$/;
  if(!passwordRegex.test(password)){
    alert("The password you entered is invalid. Please enter a valid password.");
    form.password.value = "";
    form.password.focus();
    return false;
  }  
  return true;
}


function validPassword(form) {

  var password = form.password.value;
  var password2 = form.password2.value;

  if(password == "" ) {
    alert("You must enter your password.");
    form.password.value = "";
    form.password.focus();
    return false;
  }
  
  if(password != password2 ) {
    alert("You must enter the same password twice.");
    form.password.focus();
    return false;
  }
  
  var passwordRegex = /^[a-zA-Z0-9]+$/;
  if(!passwordRegex.test(password)){
    alert("The password you entered is invalid. Please enter a valid password.");
    form.password.value = "";
    form.password.focus();
    return false;
  }  
  return true;
}