image print out code with javascript

 <script language="javascript" type="text/javascript">
        function PrintImage() {
            printWindow = window.open("", "mywindow", "location=1,status=1,scrollbars=1,width=600,height=600");
            printWindow.document.write("<div style='width:100%;'>");
            printWindow.document.write("<img id='img' src='" + document.getElementById('calendarImage').src + "'/>");
            printWindow.document.write("</div>");
            printWindow.document.close();
            printWindow.print();
        }

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<input type="image" src="images/print.png" alt="Print this page" onclick="PrintImage()" />