if ((screen.width == 640) && (screen.height == 480)) {var css = "res800";}
   else if ((screen.width == 800) && (screen.height == 600)) {var css = "res800";}
   else if ((screen.width == 1024) && (screen.height == 768)) {var css = "res1024";}
   else {var css = "res1024";};
   document.write("\<link rel=\"stylesheet\" type=\"text\/css\" href=\"styles\/" + css + ".css\"\>");