Show div onclick regardless of clicked button

I know little about javascript and on my page I have a button that, when clicked, calls a div . So far so good, but the function takes the id of the button, that is, if I have more than one button on the page and need to call div will not work. I need to change the function to get the button by parameter in onclick and not fixed by id .

How are you?

<button type="submit" id="submitbtn">//Gostaria de chamar a função no onclick passando qualquer botão como parametro

Function:

    $(function () {
    $("#submitbtn").click(function () {//Aqui seria a passagem do parâmetro
        $("#loading").fadeIn();
        var opts = {
            lines: 12, // The number of lines to draw
            length: 7, // The length of each line
            width: 4, // The line thickness
            radius: 10, // The radius of the inner circle
            color: '#000', // #rgb or #rrggbb
            speed: 1, // Rounds per second
            trail: 60, // Afterglow percentage
            shadow: false, // Whether to render a shadow
            hwaccel: false // Whether to use hardware acceleration
        };
        var target = document.getElementById('loading');
        var spinner = new Spinner(opts).spin(target);
    });
});