function popup(url) {
        winname="Screenshots";
        var popupwindow;
        if (popupwindow) {
                if (popupwindow.closed == true) {
                        window.open(url,winname,"scrollbars=1,toolbar=0,location=0,directories=0,status=0,resizable=1,width=660,height=565");
                        if (window.focus) popupwindow.focus();
                } else {
                        popupwindow.location = url;
                        if (window.focus) popupwindow.focus();
                }
        } else {
                popupwindow = window.open(url, "", "scrollbars=1,toolbar=0,location=0,directories=0,status=0,resizable=1,width=660,height=565");
                if (window.focus) popupwindow.focus();
        }
}