How to print a rtl div in asp web page?

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ASP.NET

Javascript

printing

I have a div that is rtl and content of the div is right to left. with the code below I print it but the result becomes left to right.

function CallPrint(strid) {
        var prtContent = document.getElementById(strid);
        var WinPrint = window.open('', '', 'letf=0,top=0,width=800,height=100,toolbar=0,scrollbars=0,status=0,dir=rtl');
        WinPrint.document.write(prtContent.innerHTML);
        WinPrint.document.dir = "rtl";
        WinPrint.document.close();        
        WinPrint.focus();
        WinPrint.print();
        WinPrint.close();
        prtContent.innerHTML = strOldOne;
    }

strid should be name of div.
How can i correct it to be printed in the right way?
Thanks in Advanced.