//レイヤーを表示する
	function showLayer(idName){
		if(document.getElementById){	document.getElementById(idName).style.visibility = 'visible'; }
		else if(document.all){			document.all(idName).style.visibility            = 'visible'; }
		else if(document.layers){		document.layers[idName].visibility               = 'show'; }
	}

	//レイヤーを非表示にする
	function hideLayer(idName){
		if(document.getElementById){	document.getElementById(idName).style.visibility = 'hidden'; }
		else if(document.all){			document.all(idName).style.visibility            = 'hidden'; }
		else if(document.layers){		document.layers[idName].visibility               = 'hide'; }
	}
	//レイヤーを初期状態に戻す。
	function clearLayer(){
		hideLayer("navi11");
		hideLayer("navi22");
		hideLayer("navi33");
		hideLayer("navi44");
		hideLayer("navi55");
		hideLayer("navi66");
		hideLayer("navi77");
		hideLayer("navi88");

		hideLayer("navi111");
		hideLayer("navi222");
		hideLayer("navi333");
		hideLayer("navi444");
		hideLayer("navi555");
		hideLayer("navi666");
		hideLayer("navi777");
		hideLayer("navi888");
				
		hideLayer("navioff");
		
		showLayer("navi01");
		showLayer("navi02");
		showLayer("navi03");
		showLayer("navi04");
		showLayer("navi05");
		showLayer("navi06");
		showLayer("navi07");
		showLayer("navi08");
	}