window.name = 'main';

  function openSitemap() {
   var width = window.screen.width;
   var height = window.screen.height;
   var x = (width  - 680) / 2;
   var y = (height - 248) / 2;
   var parameters = 'left=' + x + ',top=' + y + ',width=680,height=247,toolbar=no,statusbar=no,resizable=no';
   var url = '/sitemap.html';
   var name = 'sitemap';
   window.open(url,name,parameters);
  }

  function openDemo() {
   var width = window.screen.width;
   var height = window.screen.height;
   var x = (width  - 600) / 2;
   var y = (height - 430) / 2;
   var parameters = 'left=' + x + ',top=' + y + ',width=600,height=430,toolbar=no,statusbar=no,resizable=no';
   var url = '/demo.html';
   var name = 'demo';
   window.open(url,name,parameters);
  }