Print div content in using Javsscript??

Below code used to print div content here we have to write printable content in "printDiv" 

    <form id="Form1" method="post" runat="server">

 <div id="printDiv">

  Printable content

 </div>

 <input type="button" value="Print" onclick="JavaScript:printPartOfPage('printDiv');">

<script type="text/javascript">

<!--

function printPartOfPage(elementId)

{

 var printContent = document.getElementById(elementId);

 var windowUrl = 'about:blank';

 var uniqueName = new Date();

 var windowName = 'Print' + uniqueName.getTime();

 var printWindow = window.open(windowUrl, windowName, 'left=50000,top=50000,width=0,height=0');

 printWindow.document.write(printContent.innerHTML);

 printWindow.document.close();

 printWindow.focus();

 printWindow.print();

 printWindow.close();

}

// -->

</script>

</form>

Njoy coding......