function  changeImg(imageNo){

	var img11 = new Image();
	var img12 = new Image();
	var img21 = new Image();
	var img22 = new Image();
	var img23 = new Image();
	var img24 = new Image();
	var img31 = new Image();
	var img41 = new Image();
	var img42 = new Image();
	var img51 = new Image();
	var img52 = new Image();

	img11.src = "../graph/kutuna_nozoita_saki_ha.jpg"
	img12.src = "../graph/kutuna_everyon_come_here.jpg"
	img21.src = "../graph/nagaoka_uraroji.jpg"
	img22.src = "../graph/nagaoka_miharashi.jpg"
	img23.src = "../graph/nagaoka_toukan.jpg"
	img24.src = "../graph/nagaoka_omise_de.jpg"
	img31.src = "../graph/shimada_no1.jpg"
	img41.src = "../graph/odaka_oyako.jpg"
	img42.src = "../graph/odaka_touhuya.jpg"
	img51.src = "../graph/yoneya_no1.jpg"
	img52.src = "../graph/yoneya_no2.jpg"

	if(imageNo == 1){
		document.images["pic_01"].src=img11.src;
	}
	else if(imageNo == 2){
		document.images["pic_01"].src=img12.src;
	}
	else if(imageNo == 3){
		document.images["pic_02"].src=img21.src;
	}
	else if(imageNo == 4){
		document.images["pic_02"].src=img22.src;
	}
	else if(imageNo == 5){
		document.images["pic_02"].src=img23.src;
	}
	else if(imageNo == 6){
		document.images["pic_02"].src=img24.src;
	}
	else if(imageNo == 7){
		document.images["pic_03"].src=img31.src;
	}
	else if(imageNo == 8){
		document.images["pic_04"].src=img41.src;
	}
	else if(imageNo == 9){
		document.images["pic_04"].src=img42.src;
	}
	else if(imageNo == 10){
		document.images["pic_05"].src=img51.src;
	}
	else if(imageNo == 11){
		document.images["pic_05"].src=img52.src;
	}
}