$(function(){
	var nowTime;
	var bgChange = function() {
		var hour = new Date().getHours();
		
		if (nowTime == hour) return;
		
		if (hour >= 6 && hour < 16) {
			$("body").css({'background': '#7cc163 url(/common/img/bg.gif) repeat-y center'});
		} else if (hour >= 16 && hour < 19) {
			$("body").css({'background': '#7cc163 url(/common/img/bg.gif) repeat-y center'});
		} else if (hour >= 19 && hour < 23) {
			$("body").css({'background': '#7cc163 url(/common/img/bg2.gif) repeat-y center'});
		} else {
			$("body").css({'background': '#7cc163 url(/common/img/bg2.gif) repeat-y center'});
		}
		
		nowTime = hour;
	};
	var intervalID = setInterval(bgChange, 5000);
	bgChange();
});