var flg=0;
var myImage = new Image();
myImage.src = "http://www.worldace.jp/wp-content/themes/golf2/images/member2.jpg";

function setMsgTenmetu(){
if(flg==10){
document.getElementById("member_a").style.backgroundImage = 'url(http://www.worldace.jp/wp-content/themes/golf2/images/member2.jpg)';
}else if(flg==11){
document.getElementById("member_a").style.backgroundImage = 'url(http://www.worldace.jp/wp-content/themes/golf2/images/member.jpg)';
}
flg++;
if(flg>30){flg=0;}
setTimeout("setMsgTenmetu()",100);
}