function openguest(name) {
    var window_width = 640;
  var window_height = 480;
    var window_left = (screen.availWidth / 2) - (window_width / 2)
    var window_top = (screen.availHeight / 2) - (window_height /2)
    var window_dimensions = "height=" + window_height +
                            ",width=" + window_width +
                            ",left=" + window_left +
                            ",top=" + window_top +
                            ",toolbar=0,menubar=0,statusbar=0,scrollbars=yes"
    var new_win = window.open( name , "Гостевая_книга", window_dimensions);
    new_win.focus()
}