var startpicno = 0;

	//透明度変更
	function chgOpa0(id){
	   var myAnim = new YAHOO.util.Anim(
	     id, { opacity : { from:1,to:0.0 } } ,0.2
	   );
	   myAnim.animate();
	}

	function chgOpa1(id){
	   var myAnim = new YAHOO.util.Anim(
	     id, { opacity : { from:0,to:1.0 } } ,0.5
	   );
	   myAnim.animate();
	}

	function headerchange(){
		//ヘッダを透明化
		chgOpa0("header");
		setTimeout( function() {
			startpicno = startpicno + 1;
			if ( startpicno > 2 ) { startpicno = 0; }
			//コンテンツ書き換え
			document.getElementById("header").className = 'header_0'+startpicno;
			//ヘッダを再表示
	  		chgOpa1("header");
		}, 200 );
	}

	function headerrotate(){
		setTimeout( function() {
			headerchange();
	  		headerrotate();
		}, 8000 );
	}

	headerrotate();