[Deff]

<div class="bla">0</div>
<div class="bla">1</div>
<div class="bla">2</div>
<div class="bla">3</div>
<div class="bla">4</div>
<script type="text/javascript" src="http://yandex.st/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready( function () {

        	$(this).on("click", ".bla", function () {
        		alert($(this).text()); // 
        	});
});

</script>

Или так:

<div class="bla">0</div>
<div class="bla">1</div>
<div class="bla">2</div>
<div class="bla">3</div>
<div class="bla">4</div>
<script type="text/javascript" src="http://yandex.st/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready( function () {
$(".bla").each ( function (i) {$(this).attr("alt",i)});
        	$(this).on("click", ".bla", function () {
        		alert($(this).attr("alt")); // 
        	});
});

</script>