add a class to an li element while looping

Hi
i have an ajax call and i loop it and present it. all this works. the issue: i create the li element, and i need to add a class only to the odd ones.

how to do it?

here is the code i have:

                for(var ii=0;ii<data.length;ii++) {
                    //alert(data[ii].date);

                    var li = '<li>
                          <div class="timeline-badge">
                          <i class="fa fa-exclamation-circle"></i>
                          </div>
                          <div class="timeline-panel">
                            <div class="timeline-heading">
                              <h4 class="timeline-title">'+data[ii].thetype+'</h4>
                              <p>
                              <small class="text-muted">
                              <i class="glyphicon glyphicon-time"></i>'+data[ii].date+'
                              </small>
                              </p>
                            </div>
                            <div class="timeline-body">
                              <p>'+data[ii].message+'</p>
                            </div>
                          </div>
                        </li>';

                        $("#alertitin").prepend( li );
                }

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best regards