if(navigator.appVersion.charAt(0) >= "3"){
	hdr_btn = new Array();
	hdr_btn[0] = new Image; hdr_btn[0].src = "img/c_hdr_btn_01_01.jpg";
	hdr_btn[1] = new Image; hdr_btn[1].src = "img/c_hdr_btn_01_02.jpg";
	hdr_btn[2] = new Image; hdr_btn[2].src = "img/c_hdr_btn_02_01.jpg";
	hdr_btn[3] = new Image; hdr_btn[3].src = "img/c_hdr_btn_02_02.jpg";
	hdr_btn[4] = new Image; hdr_btn[4].src = "img/c_hdr_btn_03_01.jpg";
	hdr_btn[5] = new Image; hdr_btn[5].src = "img/c_hdr_btn_03_02.jpg";
	hdr_btn[6] = new Image; hdr_btn[6].src = "img/c_hdr_btn_04_01.jpg";
	hdr_btn[7] = new Image; hdr_btn[7].src = "img/c_hdr_btn_04_02.jpg";
	hdr_btn[8] = new Image; hdr_btn[8].src = "img/c_hdr_btn_05_01.jpg";
	hdr_btn[9] = new Image; hdr_btn[9].src = "img/c_hdr_btn_05_02.jpg";
}

function chg_hdr_btn(a,b){  //aは下のnameに対応し、bは上の配列に対応
	if(navigator.appVersion.charAt(0) >= "3"){
		document.images["hdr_btn_" +a].src=hdr_btn[b].src;
	}
}