HTML count of button clicks

<!DOCTYPE HTML>
<html>
  <head>
    <script type="text/javascript">
      function count_zzz() {
        for(var i=1; i<=3; i++) {
          alert("Count Of Clicks: "+i+" has been made!")
        }
      }
    </script>
 </head>
 <body>
    <input type="button" onclick="count_zzz()" value="Count Of Button Clicks!"/>
 </body>
</html>