[ruslan_mart]

<div id="div">
   <p id="f1"></p>
   <p id="f2"></p>
   <p id="f3"></p>
   <p id="f4"></p>
   <p id="f5"></p>
</div>

$('#div').on('click', 'p', function() {
   var f = /f(\d+)/.exec(this.id)[1];
   $.get('index.php', 'turn=' + f, myCallback, 'json');
});