function openPrintWindow(url) {
    var centerWidth = (window.screen.width - 750) / 2;
    var centerHeight = (window.screen.height - 600) / 2;

    newwindow=window.open(url,'name','scrollbars=yes,height=600,width=820,resizable=yes,left=' + centerWidth + ',top=' + centerHeight);
    if(window.focus) {newwindow.focus()}
    return false;
}