Printing content of a particular area of a page through Java Script function.

This is the way to print content of a particular div through this function. Very basic but important :

function PrintContent(ctrl) {
        var DocumentContainer = ctrl;
        var WindowObject = window.open('', "TrackHistoryData",
            "width=420,height=225,top=250,left=345,toolbars=no,scrollbars=yes,status=no,resizable=no");
        WindowObject.document.write(DocumentContainer.innerHTML);
        WindowObject.document.close();
        WindowObject.focus();
        WindowObject.print();
        WindowObject.close();
    }

You need to put this iframe for better preview..

<iframe id="ifmcontentstoprint" style="height: 0px; width: 0px; position: absolute">
</iframe>

This is function for whole Page :

 function printPage() {
        var content = document.getElementById("Your Div ID");
        var pri = document.getElementById("ifmcontentstoprint").contentWindow;
        pri.document.open();
        pri.document.write(content.innerHTML);
        pri.document.close();
        pri.focus();
        pri.print();
    }