function changeLogo(){
    dateObj = new Date();
	var strArray1 = new Array(
		'/images/blog-title1-1.jpg',
		'/images/blog-title2-1.jpg',
		'/images/blog-title3-1.jpg'
	);
                            
	var strArray3 = new Array(
		'/images/btn_globalNav_01_01.gif',
		'/images/btn_globalNav_02_01.gif',
		'/images/btn_globalNav_03_01.gif'
	);

	var strArray4 = new Array(
		'/images/btn_globalNav_01_02.gif',
		'/images/btn_globalNav_02_02.gif',
		'/images/btn_globalNav_03_02.gif'
	);

	var strArray5 = new Array(
		'/images/btn_globalNav_01_03.gif',
		'/images/btn_globalNav_02_03.gif',
		'/images/btn_globalNav_03_03.gif'
	);

	var nowtime = dateObj.getHours();
	if ((nowtime < 4) || (nowtime < 16 && nowtime >= 12)) {
		Changecss('layout_1');
		document.logoTitle.src=strArray1[0];
		document.topNav1.src=strArray3[0];
		document.topNav2.src=strArray4[0];
		document.topNav3.src=strArray5[0];
	} else if ((nowtime < 8 && nowtime >= 4 ) || (nowtime < 20 && nowtime >= 16)){
		Changecss('layout_2');
		document.logoTitle.src=strArray1[1];
		document.topNav1.src=strArray3[1];
		document.topNav2.src=strArray4[1];
		document.topNav3.src=strArray5[1];
	}else{
		Changecss('layout_3');
		document.logoTitle.src=strArray1[2];
		document.topNav1.src=strArray3[2];
		document.topNav2.src=strArray4[2];
		document.topNav3.src=strArray5[2];
	}
}