title: When to use '$(this)' and 'this' in a jQuery plugin? (Article on net.tutsplus.com)
body: <p>I'm learning jQuery now, and was reading an article of Jeffrey Way, <a href="http://net.tutsplus.com/videos/screencasts/you-still-cant-create-a-jquery-plugin/" rel="nofollow noreferrer">"You Still Can’t Create a jQuery Plugin?"</a> 
  Almost everything is clear, but there are some points that I still cannot understand.</p>
  
  <p>Problems begin on the 'Step 3: Building the Plugin', heading title 'For Each...', and next 'Error Checking'.</p>
  
  <pre><code>   this.each(function() {  
       $this = $(this);
       var title = this.title; 
       if ($this.is('a') &amp;&amp; $this.attr('title') != '') {  
         this.title = '';  
         $this.hover(function(e){  
  </code></pre>
  
  <p>Questions</p>
  
  <ol>
  <li><p><code>this.title</code> - what a method is it? When we use jQuery we type <code>$(this).attr('title')</code> - and jQuery was created to simplify development) 
  Does <code>this.title</code> refer to a DOM Specification, or Javascript built-in methods?</p></li>
  <li><p>I totally cannot understand what is going on with <code>this</code> keyword here, when do we have to use <code>this</code> and when <code>$(this)</code>? Why do we use <code>this.each(func</code>..., and not <code>$(this).each(func</code>...? (I've tested it - and it works too, but what is a difference?) I know that factory method <code>$()</code> returns a wrapped set of DOM elements, but why do we use <code>this.title</code> here (and again <code>$(this).attr('title')</code> does the job)? 
  I made a little bit of testing. We can type <code>this.title</code> or <code>title</code> instead of <code>$this.attr('title')</code> in the conditional statement, but if only we use anything (<code>title</code> or <code>$(this).attr('title')</code>) instead of <code>this.title</code> in the statement <code>this.title = '';</code> - it doesn't work.</p></li>
  <li><p>Well, we specified <code>var title = this.title;</code>. But when we use this variable, why do we declare it?</p></li>
  </ol>
  
  <p>I think that some of you can understand even better than me, understanding of what things I need, so I finish my explanation)
  Thank you very, very much, if you can make it clear)</p>