var banners = new Array(4);
banners[0] = new Banner('http://rgsw.net/wp-content/img/Top_test1.jpg', 'http://rgsw.net/'); 
banners[1] = new Banner('http://rgsw.net/wp-content/img/Top_test2.jpg', 'http://rgsw.net/'); 　
banners[2] = new Banner('http://rgsw.net/wp-content/img/Top_test3.jpg', 'http://rgsw.net/');
banners[3] = new Banner('http://rgsw.net/wp-content/img/Top_test4.jpg', 'http://rgsw.net/');

var banner_no = -1;

function Banner(img_src, url)
{
this.img = new Image();
this.img.src = img_src;
this.url = url;
}

function rotate_banner()
{
banner_no = (banner_no + 1) % banners.length;
document.images['banner'].src = banners[banner_no].img.src;
setTimeout("rotate_banner()", 2500); //　　
}

function jump()
{
location.href = banners[banner_no].url;
}