function randomtop()
{

image_count = 1;  //今回は画像

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

if (image_number == 0) { img = "./img/20111220top.jpg";
top_alt="冬コミ参加しますー";
addl = "<A HREF='eventinfo.html'>";
addl2 = "</A>";
}
else if (image_number == 2) { img = "./img/20111220top.jpg";
top_alt="冬コミ参加しますー";
addl = "<A HREF='eventinfo.html'>";
addl2 = "</A>";
}
else  { img = "./img/20111123top.jpg";
top_alt="ねこねこソフト新作お手伝い中";
addl = "<A HREF='./teaser/index.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