JQuery Smart Wizard onFinish not working

Question

I have this code of the form wizard.

<div id="wizard" class="form_wizard wizard_horizontal">
   <ul class="wizard_steps">
      <!-- the <li> -->
   </ul>
   <div id="step-1">
   </div>
   <div id="step-2">
   </div>
</div>

Then I have this code. The problem is that whenever I click the finish button, the function is not being triggered. The alert doesn't show up. Is there a problem in my code?

$('#wizard').smartWizard({
    onFinish:onFinishCallback
});
function onFinishCallback(){
    alert("Finished");
}