title: jquery selector for div with class
body: <p>I tried this below. I think the return Object of <strong>$("div.tab_select")[0]</strong> isn't a jQuery Object, but I can't even use pure javascript method.</p>
  
  <p>Is there any way to make it jQuery Object? for instance <strong>$($("div.tab_select")[0])</strong>..I know this's silly;</p>
  
  <p>Thank you for reading.</p>
  
  <pre><code>var tmp = $("div.tab_select")[0]; 
  alert(tmp); //This gives me HTMLDivElement collectly. But I can't use any of javascript..
  
  alert(tmp.nodeName); //But this give me error "Uncaught TypeError: Cannot read property 'nodeName' of undefined"
  
  tmp.hide(); //Neither, I can't use this.
  </code></pre>