Adding an IMG title attribute

Roll the mouse over the images before clicking the mouse - no descriptive text is visible.
Then click the button and roll the mouse over the images - a descriptive text appears.

The jQuery Code START

    
    <script type="text/javascript" 
    src="http://code.jquery.com/
    jquery-latest.js">
    </script>
    <script type="text/javascript">
      function addTitle() {
        $("img").each(function(m){
          this.alt="Image " + (m + 1);
        });
      }
    </script>
    
    <style type="text/css">
      .code {color: red;}
      .back {background-color: yellow;}
    </style>
  </head>

  <body>
   <h1>Adding IMG title attribute</h1>
   <img src="images/image1.jpg" alt="flower1"/>
   <img src="images/image2.jpg" alt="flower2"/>
   <img src="images/image3.jpg" alt="flower3"/>
   <img src="images/image4.jpg" alt="flower4"/>
   <br />
   <form action="">
   <input type="button" 
   value="Add alt attributes" 
   onclick="addTitle()"></input>
   </form>