<form action="" method="post" onSubmit="return login()">

                    <label id="usernameLabelID" for="username">Username:</label>
                    <input id="username" name="username" type="text" aria-required="true"/>
                    <br>
                    <label id="passwordLabelID" for="password">Password:</label>
                    <input id="password" name="password" type="password" aria-required="true"/>

                    <div>
                        <input id="chkpreloginip" name="chkpreloginip" type="hidden" value="true" aria-required="false"/>
                    </div>

                    <select id="langButton" onchange="changeInterfaceLang()">
                        <option value="pl">Polski</option>
                        <option value="en-us">English</option>
                        <option value="es">Español</option>
                        <option value="de">Deutsch</option>
                        <option value="fr">Français</option>
                        <option value="it">Italiano</option>
                    </select>
                    <br/>
                    <button id="signin" type="submit" class="Convergence-Login-FormButton" dojoType="dijit.form.Button" >Zaloguj</button>

                </form>