$(document).ready(function(){
	var jmp = [
		"http://ja-jp.facebook.com/mamoruchikara",
		"http://yfff.jp/",
		"http://www.jsgoal.jp/special/2011j2book/"
	];

	var img = [
		"/_parts/random_banner/00000069.gif",
		"/_parts/random_banner/00000068.jpg",
		"/_parts/random_banner/00000067.gif"
	];

	var tar = [
		"_blank",
		"_blank",
		"_blank"
	];
	
	var n = Math.floor(Math.random()*jmp.length);

	var str = '<a href="'+jmp[n]+'" target="'+tar[n]+'"><img src="'+img[n]+'" /></a>';

	$('#banner').append(str);
});