function ChangeB(){
var RANSUU = Math.random()*21;
if( RANSUU < 1 )	{	window.open("http://www.f-ocean.gr.jp/sponser01.htm","sponser");
}else{
if( RANSUU < 2 )	{	window.open("http://www.f-ocean.gr.jp/sponser02.htm","sponser");
}else{
if( RANSUU < 3 )	{	window.open("http://www.f-ocean.gr.jp/sponser03.htm","sponser");
}else{
if( RANSUU < 4 )	{	window.open("http://www.f-ocean.gr.jp/sponser04.htm","sponser");
}else{
if( RANSUU < 5 )	{	window.open("http://www.f-ocean.gr.jp/sponser05.htm","sponser");
}else{
if( RANSUU < 6 )	{	window.open("http://www.f-ocean.gr.jp/sponser06.htm","sponser"); 
}else{
if( RANSUU < 7 )	{	window.open("http://www.f-ocean.gr.jp/sponser07.htm","sponser");
}else{
if( RANSUU < 8 )	{	window.open("http://www.f-ocean.gr.jp/sponser08.htm","sponser");
}else{
if( RANSUU < 9 )	{	window.open("http://www.f-ocean.gr.jp/sponser09.htm","sponser");
}else{
if( RANSUU < 10 )	{	window.open("http://www.f-ocean.gr.jp/sponser10.htm","sponser");
}else{
if( RANSUU < 11 )	{	window.open("http://www.f-ocean.gr.jp/sponser11.htm","sponser");
}else{
if( RANSUU < 12 )	{	window.open("http://www.f-ocean.gr.jp/sponser12.htm","sponser");
}else{
if( RANSUU < 13 )	{	window.open("http://www.f-ocean.gr.jp/sponser13.htm","sponser");
}else{
if( RANSUU < 14 )	{	window.open("http://www.f-ocean.gr.jp/sponser14.htm","sponser");
}else{
if( RANSUU < 15 )	{	window.open("http://www.f-ocean.gr.jp/sponser15.htm","sponser");
}else{
if( RANSUU < 16 )	{	window.open("http://www.f-ocean.gr.jp/sponser16.htm","sponser");
}else{
if( RANSUU < 17 )	{	window.open("http://www.f-ocean.gr.jp/sponser17.htm","sponser");
}else{
if( RANSUU < 18 )	{	window.open("http://www.f-ocean.gr.jp/sponser18.htm","sponser");
}else{
if( RANSUU < 19 )	{	window.open("http://www.f-ocean.gr.jp/sponser19.htm","sponser");
}else{
window.open("http://www.f-ocean.gr.jp/sponser20.htm","sponser");	
}
}}}}}}}}}}}}}}}}}}
}