<script src="http://code.jquery.com/jquery-latest.js"></script>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
<script>
var totaal = 0;
$("p").each(function(){
totaal += parseInt($(this).text())
})
alert(totaal);
</script>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
<script>
var totaal = 0;
$("p").each(function(){
totaal += parseInt($(this).text())
})
alert(totaal);
</script>