// Contents of includes/front_page.sah below
function FrontPage() {
    this.selectors = {
        username: 'data[User][email]',
        password: 'data[User][password]'
    };
}

FrontPage.prototype.loginAs = function($username, $password) {
    console.log($username, $password);
    _setValue(_textbox(this.selectors.username), $username);
    _setValue(_password(this.selectors.password), $password);
    _click(_link("Log ind"));
}

// Contents of login.sah below
var $frontPage = new FrontPage();

$frontPage.loginAs('myusername', 'mypassword');