function show_track(tracker_frame) {
    if (curr_tracker_frame != tracker_frame) {
        if (curr_tracker_frame != 0) {
            Effect.SlideUp('tracker_details' + curr_tracker_frame);
            ttarget = document.getElementById("tracker_a" + curr_tracker_frame);
            ttarget.style.display = "";
            ttarget = document.getElementById("tracker_b" + curr_tracker_frame);
            ttarget.style.display = "none";
            setTimeout("Effect.SlideDown('tracker_details" + tracker_frame + "');", 650);
        } else {
            Effect.SlideDown('tracker_details' + tracker_frame);
        }                        
        ttarget = document.getElementById("tracker_a" + tracker_frame);
        ttarget.style.display = "none";
        ttarget = document.getElementById("tracker_b" + tracker_frame);
        ttarget.style.display = "";
        curr_tracker_frame = tracker_frame;
    } else {
        Effect.SlideUp('tracker_details' + curr_tracker_frame);
        ttarget = document.getElementById("tracker_a" + curr_tracker_frame);
        ttarget.style.display = "";
        ttarget = document.getElementById("tracker_b" + curr_tracker_frame);
        ttarget.style.display = "none";
        curr_tracker_frame = 0;
    }
}