xx = Math.floor(Math.random() * 5);

if(xx == "0"){

	top_img ="http://www61.tok2.com/home2/studiozex/CG/menu1/natsuki.gif";

}

else if(xx == "1"){

	top_img ="http://www61.tok2.com/home2/studiozex/CG/menu1/nukunuku.gif";

}

else if(xx == "2"){

	top_img="http://www61.tok2.com/home2/studiozex/CG/menu1/eclair_fortop.gif";

}

else if(xx == "3"){

	top_img="http://www61.tok2.com/home2/studiozex/CG/menu1/chobits_fortop.gif";

}

else if(xx == "4"){

	top_img="http://www61.tok2.com/home2/studiozex/CG/menu1/ruri_cat.png";

}
//document.write(top_img);