function n1() {
		document.images.nav1.src='img/back_navi1_hi_en.jpg';
		document.getElementById("navi1").style.zIndex="11";
	}
	function n1_zu() {
		document.images.nav1.src='img/back_navi1_en.gif';
		document.getElementById("navi1").style.zIndex="4";
	}
	
	function n2() {
		document.images.nav2.src='img/back_navi2_hi_en.jpg';
		document.getElementById("navi2").style.zIndex="8";
	}
	function n2_zu() {
		document.images.nav2.src='img/back_navi2_en.gif';
		document.getElementById("navi2").style.zIndex="3";
	}
	
	function n3() {
		document.images.nav3.src='img/back_navi3_hi_en.jpg';
		document.getElementById("navi3").style.zIndex="6";
	}
	function n3_zu() {
		document.images.nav3.src='img/back_navi3_en.gif';
		document.getElementById("navi3").style.zIndex="2";
	}
	
	function n4() {
		document.images.nav4.src='img/back_navi4_hi_en.jpg';
		document.getElementById("navi4").style.zIndex="5";
	}
	function n4_zu() {
		document.images.nav4.src='img/back_navi4_en.gif';
		document.getElementById("navi4").style.zIndex="1";
	}
	
	
	
	
	function n1a() {
		document.images.nav1.src='img/back_navi1_mo_en.jpg';
		document.getElementById("navi1").style.zIndex="11";
	}
	
	function n2a() {
		document.images.nav2.src='img/back_navi2_mo_en.jpg';
		document.getElementById("navi2").style.zIndex="11";
	}
	
	function n2b() {
		document.images.nav2.src='img/back_navi2_mo_r_en.jpg';
		document.getElementById("navi2").style.zIndex="11";
	}
	
	function n3a() {
		document.images.nav3.src='img/back_navi3_mo_en.jpg';
		document.getElementById("navi3").style.zIndex="11";
	}
	
	function n3b() {
		document.images.nav3.src='img/back_navi3_mo_r_en.jpg';
		document.getElementById("navi3").style.zIndex="11";
	}
	
	function n4a() {
		document.images.nav4.src='img/back_navi4_mo_r_en.jpg';
		document.getElementById("navi4").style.zIndex="11";
	}