function createUser() {
        var username = document.getElementById("inputUsername").value;
        var password = document.getElementById("inputPassword").value;
        var rank = document.getElementById("inputRank").value;
        if(username === "" || password === "" || rank === ""){
            showErrorMessage();
        }else{

            $.ajax({
                type: "POST",
                url: "./createAccount.php",
                dataType: 'html',
                data: {username: username, password: password, rank: rank},
                success: function(data, textStatus, xhr) {
                    if(xhr.status === 200){
                        showSuccessMessage();
                    }else{
                        showInternError();
                    }
                }
            });
        }

    }