Why does function only work once?

Why does function only work once?

Having problems that my function only seems to execute once...code:

  2. <html>
  3. <head>

  5. <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
  6. <script type="text/javascript" >
  7. $(document).ready(function(){
  8.     
  9. $("*[id^=\'ST\']").each(function() {
  10.        $(this).click(function() {
  11. string = this.id.substring(2);
  12. string2 = "#" + string;
  13. $(string2).load('tips/'+this.id+'.txt');
  14.      });
  15.    });
  18.  });  

  20.        
  21.     

  23. </script> 

  25. </head>
  26. <body>
  27. <a id="STtextfield">[+]</a>
  28. <textarea name="textfield" id="textfield"></textarea>
  29. </body>
  30. </html>
    31.