Here is the code
Html
<div id="printableArea">
<h1>Print me</h1>
</div>
<input type="button" onclick="printDiv('printableArea')" value="print a div!" />
javascript
<script>
function printDiv(elem)
{
var mywindow = window.open('', 'PRINT', '');
mywindow.document.write('<html><head><title>' + document.title + '</title>');
mywindow.document.write('</head><body >');
mywindow.document.write('<h1>' + document.title + '</h1>');
mywindow.document.write(document.getElementById(elem).innerHTML);
mywindow.document.write('</body></html>');
mywindow.document.close();
mywindow.focus();
mywindow.print();
mywindow.close();
return true;
}
</script>
