function yhteystiedot_popup(url, mw, mh) {
        var ox = mw;
        var oy = mh;
        if((ox>=screen.width) || (oy>=screen.height)) {
                var ox = screen.width-150;
                var oy = screen.height-150;
                var winx = (screen.width / 2)-(ox / 2);
                var winy = (screen.height / 2)-(oy / 2);
        }
        else {
                var winx = (screen.width / 2)-(ox / 2);
                var winy = (screen.height / 2)-(oy / 2);
        }
        var win = window.open(url, 'yhteyspop', 'height='+oy+'-10,width='+ox+',top='+winy+',left='+winx+',scrollbars=1,resizable');
}