<div class="box">
  <div class="item" data-category="#music"> CLICK </div>
</div>

<div class="box">
  <div class="item" data-category="#movies"> CLICK </div>
</div>

...etc ...

$('.box').click(function() {
    $('#dialogbox').show();
});

<div id="music"> ALL INFORMATION ABOUT MUSIC </div>
<div id="movies"> ALL INFORMATION ABOUT MOVIES </div>

... etc ...