function randomtop()
{

image_count = 4;  //今回は画像

image_number = Math.floor(Math.random() * image_count);

if (image_number == 0) { img = "./img/20100715top.jpg";
top_alt="おかえしＣＤ７公開
ちょこっとFD２の体験版みたいなのも。";
addl = "<A HREF='chocottoFD2/index.html' >";
addl2 = "</A>";
}
else if (image_number == 1)  { img = "./img/20100724top.jpg";
top_alt="コミケ参加しますー！&#13;&#10;通販受付はじめました";
addl = "<A HREF='./eventinfo.html'>";
addl2 = "</A>";
}
else  { img = "./img/20100724top.jpg";
top_alt="コミケ参加しますー！&#13;&#10;通販受付はじめました";
addl = "<A HREF='eventinfo.html'>";
addl2 = "</A>";
}

top_image = addl + "<IMG NAME='top_image' SRC='"+ img +"' ALT="+ top_alt +" BORDER='0' WIDTH='400' HEIGHT='550'>" +addl2 ;

document.write(top_image);

};

// end