/* ch-header.js */

function changeHeadImage() {
	var d = new Date();
	var h = d.getHours();
	var cName = "";
	if(d.getHours() >= 4 && d.getHours() < 6) {
		cName = "header_4_6";
	} else if(d.getHours() >= 6 && d.getHours() < 15) {
		cName = "header_6_15";
	} else if(d.getHours() >= 15 && d.getHours() < 19) {
		cName = "header_15_19";
	} else {
		cName = "header_19_4";
	}
	$('header').toggleClass(cName);
}