function switchCSS()
{
  if(window.screen.availWidth < 1024)
  {
    var mySheets = document.getElementsByTagName('link');

    for(var i = 0; i < mySheets.length; i++)
    {
      var res = mySheets[i].getAttribute('href');

      if(res.indexOf('_1024') > 0)
      {
        var regexp = /_1024/g;
        var res_new = res.replace(regexp, "_800");
        mySheets[i].setAttribute('href', res_new, 0);
      }
    }
  }
}