title: stringByEvaluatingJavaScriptFromString is not working in iOS 6
body: <p>I am seeing problem happen only on iOS 6 but working fine on below iOS 6 version. </p>
  
  <p>My app is loading image from a link which need to enlarge its image pixels to populate within size of UIWebView by using Javascript. The link image is originally in pixels 140x24. </p>
  
  <p>I see it is running over the line, but the image not being scaled up using iOS 6 simulator. It does work in iOS 5 simulator. Please help. </p>
  
  <pre><code>(void)webViewDidFinishLoad:(UIWebView *)webView {
  
    [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName(\"img\")(0).height=\"30\";document.getElementsByTagName(\"img\")(0).width=\"280\";"];
  
  }
  </code></pre>