var querywindow = '';

function open_window(url, ww, hh) {

    window.name = "simpleWindow";
    if (!querywindow.closed && querywindow.location) {
        querywindow.focus();
    } else {
        querywindow=window.open(url,'',"resizable=yes,width="+ww+",height="+hh);
    }

    if (!querywindow.opener) {
       querywindow.opener = self;
    }

    if (window.focus) {
        querywindow.focus();
    }

    return false;
}