title: jquery if text input does *not* equal blank
body: <p>I am trying to work out how to do something if a certain text box is <em>not</em> empty (i.e. contain something, could be anything)</p>
  
  <p>This is my code (that doesnt seem to work)</p>
  
  <pre><code>if ( !($('#edit-sPostalCode').attr('val','')) ) {
      stuff here
  }
  </code></pre>
  
  <p>What have I missed?</p>