function random(){

url = new Array(17); 
img = new Array(url.length); 

i = Math.floor(Math.random( ) * url.length);


url[0]="http://www.jasupo.com/report/sizen.htm";
img[0]="http://www.jasupo.com/renewal_topbanner/top_itojima.jpg";

url[1]="http://www.jasupo.com/special/boll.htm";
img[1]="http://www.jasupo.com/renewal_topbanner/top_showa.gif";

url[2]="http://www.jasupo.com/wear/wear_juic1.htm";
img[2]="http://www.jasupo.com/renewal_topbanner/top_linin.jpg";

url[3]="http://www.jasupo.com/world_goods/rubber_in1.htm";
img[3]="http://www.jasupo.com/renewal_topbanner/top_world.gif";

url[4]="http://www.jasupo.com/rubber/rubber_butterfly.htm#g3";
img[4]="http://www.jasupo.com/renewal_topbanner/top_g3.jpg";

url[5]="http://www.jasupo.com/choice/wear_5.htm";
img[5]="http://www.jasupo.com/renewal_topbanner/top_samurai_jasupo.gif";

url[6]="http://www.jasupo.com/special/pingpong_strap2.htm";
img[6]="http://www.jasupo.com/renewal_topbanner/top_strap.gif";

url[7]="http://www.jasupo.com/rubber/rubber_butterfly2.htm";
img[7]="http://www.jasupo.com/renewal_topbanner/top_briycespeed.gif";

url[8]="http://www.jasupo.com/uniform/index.html";
img[8]="http://www.jasupo.com/renewal_topbanner/top_uniform.gif";

url[9]="http://www.jasupo.com/special/pingpong_strap.htm";
img[9]="http://www.jasupo.com/renewal_topbanner/jasupo_tsrap.gif";

url[10]="http://www.jasupo.com/choice/wear_4.htm";
img[10]="http://www.jasupo.com/renewal_topbanner/top_samurai.gif";

url[11]="http://www.jasupo.com/choice/wear_3.htm";
img[11]="http://www.jasupo.com/renewal_topbanner/top_smash.gif";

url[12]="http://www.jasupo.com/report/miniracket.htm";
img[12]="http://www.jasupo.com/renewal_topbanner/top_miniracket.gif";

url[13]="http://www.jasupo.com/choice/chn_1.htm";
img[13]="http://www.jasupo.com/renewal_topbanner/china.gif";

url[14]="http://www.jasupo.com/report/rubber_on.htm";
img[14]="http://www.jasupo.com/renewal_topbanner/top_rubber_on.gif";

url[15]="http://www.jasupo.com/book/book_report1.htm";
img[15]="http://www.jasupo.com/renewal_topbanner/top_report.jpeg";

url[16]="http://www.jasupo.com/rubber/rubber_butterfly.htm#tenergy64";
img[16]="http://www.jasupo.com/renewal_topbanner/top_tenergy64.jpg";

/*ラケット・ラバー*/

document.write('<a href="'+url[i]+'">'); 
document.write('<img src="'+img[i]+'" border="0"></a>');

}