var width = document.viewport.getDimensions().width;

if (width < 1280) {
   document.writeln('<link rel=\"stylesheet\" href=\"css/1024.css\" type=\"text/css\">');
   document.writeln('<link rel=\"stylesheet\" type=\"opera/css\" href=\"css/opera_1024.css\">');
}	
else if (width < 1600) {
   document.writeln('<link rel=\"stylesheet\" href=\"css/1280.css\" type=\"text/css\">');
   document.writeln('<link rel=\"stylesheet\" type=\"opera/css\" href=\"css/opera_1280.css\">');
}
else {
   document.writeln('<link rel=\"stylesheet\" href=\"css/1600.css\" type=\"text/css\">');
   document.writeln('<link rel=\"stylesheet\" type=\"opera/css\" href=\"css/opera_1600.css\">');
}