title: Dynamically changing costs in custom pc builder with checked inputs
body: <p>First, <a href="http://jsfiddle.net/HpEJf/4/" rel="nofollow">please take a look at my fiddle.</a></p>
  
  <p>I'm trying to figure out a clean way of making the price next to each item change when any item is selected (in that group, you can image that there will be graphics cards etc in a different section which also will need the same functionality).</p>
  
  <p>If its positive I need the class to be <code>.positive</code> and vice versa, and if the item is selected <code>(+0)</code> then the price difference wont be displayed.</p>
  
  <p>This will also be used on checkbox's.</p>
  
  <p><a href="http://jsfiddle.net/FRGJE/3/" rel="nofollow">Non-working example.</a></p>