var css = new Array(
"http://jaga.placeark.com/backcolor/jaga-afternoon.css",
"http://jaga.placeark.com/backcolor/jaga-night.css",
"http://jaga.placeark.com/backcolor/jaga-snow-afternoon.css",
"http://jaga.placeark.com/backcolor/jaga-snow-night.css"
);
var now = new Date();
var month = now.getMonth() + 1;
var hour = now.getHours();
var m;
var n;
if(3 <= month && month < 12) m = 0; else m = 2;
if(6 <= hour && hour < 18) n = 0; else n = 1;
var tag = "<link rel=\"stylesheet\" href=\"" + css[n|m] + "\" type=\"text\/css\" charset=\"Shift_JIS\">";
document.write(tag);