//ロールオーバー
function clearAll(){
	alert("OK");
    document.getElementById("artistmessa").src="images/btn_anavi02.gif";
	document.getElementById("proSystem").src="images/btn_anavi03.gif";
}
function changeImg1(){document.getElementById("artistmessa").src="images/btn_anavi02_on.gif";}
function backImg1(){document.getElementById("artistmessa").src="images/btn_anavi02.gif";}
function changeImg2(){document.getElementById("proSystem").src="images/btn_anavi03_on.gif";}
function backImg2(){document.getElementById("proSystem").src="images/btn_anavi03.gif";}
function changeImg3(){document.getElementById("schoolMessage").src="images/btn_anavi01_on.gif";}
function backImg3(){document.getElementById("schoolMessage").src="images/btn_anavi01.gif";}