url= new Array();
//ジャンプ先のURL
url[0] = "seminar111130.html";
url[1] = "seminar120225.html";
url[2] = "seminar120125.html";
url[3] = "seminar120306.html";
url[4] = "seminar120512.html";
//url[5] = "seminar111130.html";
//url[6] = 
				

banner= new Array();
//表示バナー配列
//括弧の中の数字はジャンプ先URLの数字と対応させて下さい
//注意：jpgとgifを間違えないように気をつけて！
banner[0] = "images/contents/seminar111130/topbn.gif";
banner[1] = "images/contents/seminar120225/topbn.jpg";
banner[2] = "images/contents/seminar120125/topbn.jpg"; 
banner[3] = "images/contents/seminar120306/topbn.jpg";
banner[4] = "images/contents/seminar120512/topbn.gif";
//banner[5] = "images/contents/seminar111130/topbn.gif";
//banner[6] = 


function my_jump(){
max_banner=banner.length;
i_num = Math.floor(Math.random() * max_banner);
document.write("<a href='"+url[i_num]+"'>");
document.write("<img src='"+banner[i_num]+"' border=0 class='rollover topright-bn2'></a>");
}