title: Simple Like/Unlike text button - adding ajax etc
body: <p>I'm trying to make a very simple Like/Unlike button in PHP (where the page does NOT refresh)
  I know there are countless tutorials on this but because I am completely new to ajax &amp; jquery, I can't figure out how to implement them (in what file does which part of the code go etc).
  I have a database of userid's and a new database of user likes.  I've gotten this far:</p>
  
  <pre><code>&lt;?php
  if (!loggedin())    {
      echo 'Please login or register to fave games';
  } else {
      $gameNum = $GAMES_REPOSITORY[$this_game][num];
      $qry = mysql_query("SELECT * FROM fave_games WHERE gamenum='".$gameNum."' AND userid='".$_SESSION[userID]."'");
      if (mysql_num_rows($qry)==0)    {
          # print button to fave
          echo 'You haven\'t liked this';     
  
      } else  {
          # print button to unfave
          echo 'You\'ve liked this';
  
      }
  }
  ?&gt;
  </code></pre>
  
  <p>This works, and it manages to check if the user has liked the page/game before or not.  And I know I can figure out the last steps, which would be inserting or deleting the like/unlike into the database.  I just can't figure out the middle bit, where ajax and jquery come in to make the text buttons and where to code their function...  Any help would be greatly appreciated.</p>