function new_window (url, window_target) {
  var window_popup = window.open(url,window_target,"toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,resizable=yes,favorites=yes");
  window_popup.focus();
}


function get_width () {
  if (!!window.screen)
  return screen.availWidth
  else
  return null
}

function get_height () {
  if (!!window.screen)
  return screen.availHeight
  else
  return null
}

function num_new_window (this_width,this_height,url,window_target) {
  if ((navigator.appVersion.indexOf('Mac',0) != -1) && (navigator.appName.charAt(0)=="M")) {
    if (!!window && url) {
      var window_popup = window.open(url,window_target,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,favorites=no");
      window_popup.focus();
      var this_x = parseInt((get_width() - this_width )/2,10);
      var this_y = parseInt((get_height() - this_height )/2,10);
      window_popup.moveTo(this_x,this_y);
      window_popup.resizeTo(this_width,this_height);
    }
  } else {
    if (!!window && url) {
      var this_x = parseInt((get_width() - this_width )/2,10);
      var this_y = parseInt((get_height() - this_height )/2,10);
      var window_popup = window.open(url,window_target,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,favorites=no,width=" + this_width + ",height=" + this_height + ",left=0,top=0,screenX=" + this_x + ",screenY=" + this_y + "");
      window_popup.focus();
    }
  }
}

function close_window () {
  window.close();
}

function back_window () {
  history.back();
}

var ms = navigator.appVersion.indexOf('MSIE');
var ie4 = (ms > 0) && (parseInt(navigator.appVersion.substring(ms + 5, ms + 6)) >= 4)
var nesc = navigator.appName.lastIndexOf('Netscape');
var nesc4 = (nesc >= 0) && (parseInt(navigator.appVersion.substring(0, 2)) >= 4);

function FullScreen (url) {
  if (nesc4) {
    window_popup = window.open(url, 'new', 'toolbar=no, location=no, directories=no, status=yes, menubar=no, scrollbars=no, resizable=no, favorites=no, width=' + window.screen.width + ', height=' + window.screen.height);
    window_popup.moveTo(0,0);
    window_popup.focus();
  } else if (ie4) {
    window.open(url, 'new', 'fullscreen=yes');
  } else {
    location.href = url;
  }
}