var w640=641
var w800=801
var w1024=1025
var w1152=1180
var w1280=1281
var w1600=1601
document.write ('<link rel="stylesheet" type="text/css" media="screen" href="css/');
if (screen.width<w640) {  document.write ('s640.css">\n');}
   else  if (screen.width<w800) { document.write ('s800.css">\n');}
   else  if (screen.width<w1024) { document.write ('s1024.css">\n');}
   else  if (screen.width<w1152) { document.write ('s1152.css">\n');}
   else  if (screen.width<w1280) { document.write ('s1280.css">\n');}
   else  if (screen.width<w1600) { document.write ('s1600.css">\n');}
   else  { document.write ('s1680.css">\n');}