ranimg = new Array();
ranimg[0] = "user_work/top/main_image/images/top_img.jpg";
ranimg[1] = "user_work/top/main_image/images/top_img02.jpg";
ranimg[2] = "user_work/top/main_image/images/top_img03.jpg";
ranimg[3] = "user_work/top/main_image/images/top_img04.jpg";
ranurl = new Array();
ranurl[0] = "child/index.htmll";
ranurl[1] = "child/index.html";
ranurl[2] = "child/index.html";
ranurl[3] = "child/index.html";
chip = Math.floor(ranurl.length * Math.random());
document.write('<a href="'+ ranurl[chip] +'"><img src="'+ ranimg[chip] +'" border="0"></a>');