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I don't get what jQuery(document) is here. I thought you always used $(document)
see here in his examples: http://sorgalla.com/projects/jcarousel/
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jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
So technically they are both the same. Not major difference between these two declaration. They used based on weather you use JavaScript then you should use $(document). ready declaration in other case you use jQuery library which is a part of JavaScript then you should use $(function) declaration.
The value of this inside a click event is a DOM element (the one that was clicked). Using $(this) converts it to a jQuery object. DOM elements do not have a hide() methods, but jQuery adds that and many other methods you can then call.
The ready() method is used to make a function available after the document is loaded. Whatever code you write inside the $(document ). ready() method will run once the page DOM is ready to execute JavaScript code.
It's like <? versus <?php: one is a shorthand version that may be vulnerable to conflicts.
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