title: ReferenceError: event is not defined on keyup event in firefox
body: <p>Why this code not work in Firefox? I want to make the switch pictures in gallery on keyup event. I had read similar problems and answers, but no one help me. jQuery 1.4.4
  My code:</p>
  
  <pre><code>  $('body').live('keyup',function(e){
  
      if(e.keyCode  == 37) {
        $('.daPrev').click()
      }
  
      else if(e.keyCode  == 39) {
        $('.daNext').click()
      }
  
    })
  </code></pre>
  
  <p>When i press, in console: </p>
  
  <pre><code>ReferenceError: event is not defined
  </code></pre>