Printing a content of page through javascript

If we want to print a content of div Here is example

strid=clientid of a div

function CallPrint(strid)

 {

        var prtContent = document.getElementById(strid);

      var WinPrint = window.open('', '', 'letf=100,top=100,width=600,height=600,toolbar=0,scrollbars=1,status=0');

            WinPrint.document.write(prtContent.innerHTML);

            WinPrint.document.close();

            WinPrint.focus();

            WinPrint.print();

            //WinPrint.close();

    }