function swapImage(btnObj,sURL)
{
btnObj.src = sURL;
}

mySrc=new Array("img/head_img_1.jpg","img/head_img_2.jpg","img/head_img_3.jpg","img/head_img_4.jpg");
n=0;
function Gazou2(){
document.myimages.src=mySrc[n];
n++;
if(n==4){n=0}
setTimeout("Gazou2()",10000);
}