Fix UIWebView chapter JavaScript

embeddedJS.m

- (void)motionBegan:(UIEventSubtype)motion 
          withEvent:(UIEvent *)event
{

#define STRINGIFY(js) #js
    NSString *js = @ STRINGIFY(
    var $elements = $('.leftArea_container>div'), 
        $rand = $elements.not(':first').eq(Math.floor(Math.random() * $elements.length));  
        $rand.slideUp(500,function(){ $(this).insertBefore($elements.first());       }).slideDown();
    );

#undef STRINGIFY
    
    [self.webView stringByEvaluatingJavaScriptFromString:js];
}

randomClass.js

var $elements = $('.leftArea_container>div'), 
    $rand = $elements.not(':first').eq(Math.floor(Math.random() * $elements.length));  
    $rand.slideUp(500,function(){ $(this).insertBefore($elements.first()); }).slideDown();