title: Round a variable up to the next closest multiple of X
body: <p>I'm looking for a way to round up a number to the next closest multiple of 250.  So for example if I had the following JS:</p>
  
  <pre><code>var containerHeight = $("#container").height();
  </code></pre>
  
  <p>...And we imagine the value of "containerHeight" was 680px, I would want a way to round up to 750px (if the value was 1007, it should round up to 1250).  I suspect this requires a solution that is more complex than I anticipate.  Or perhaps jQuery has a built in function that will make this feasible?</p>
  
  <p>I suppose this is more of a math question than it is a jQuery question (but my jQuery syntax knowledge is also a bit limited :)</p>
  
  <p>Any ideas / bits of help are greatly appreciated,
  Thanks!</p>