function randomJump(){
	var theURL = new Array();
	theURL[0] = "mirror.html";
	theURL[1] = "paper/bluesky.html";
	theURL[2] = "paper/clover.html";
	theURL[3] = "paper/slpink.html";
	theURL[4] = "paper/japanred.html";
	ImageCount = 5;		//　画像の最大枚数
	var num = Math.floor(Math.random() * ImageCount);
	document.write("<A HREF='"+theURL[num]+"'>");
	document.write("<IMG SRC='images/ba"+num+".jpg' BORDER='0'></A>");
}