//==================== popup window ====================//

windowName  = "Popup";
params      = "top=" + (((screen.height - 475)/2) - 20) + ",";
params     += "left=" + (((screen.width - 776)/2) - 20) + ",";
params     += "toolbar=0,";
params     += "location=0,";
params     += "directories=0,";
params     += "status=0,";
params     += "menubar=0,";
params     += "scrollbars=1,";
params     += "resizable=1,";
params     += "width=776,";
params     += "height=475";

function popup(url)
{
   win = window.open(url, windowName, params);
   win.focus();

   if (!win.opener) {
      win.opener = window;
   }
}