var CSS = new Array(3);
CSS[0] = '<link href="css/daytime.css" rel="stylesheet" type="text/css" />';
CSS[1] = '<link href="css/evening.css" rel="stylesheet" type="text/css" />';
CSS[2] = '<link href="ccs/night.css" rel="stylesheet" type="text/css" />';

var BGD = new String();
var TIME = new Date();

TIME = TIME.getHours();
if(TIME >= 6 && TIME <= 15){		BGD = CSS[0];	}
	else if(TIME >= 16 && TIME <= 19){	BGD = CSS[1];	}
	else{	BGD = CSS[2];	}

document.write(BGD);