function RandomImg(){
	var JumpImg= new Array();
	JumpImg[0] = "http://www.t-com.ne.jp/banner/b_adsl_cashback46860.gif";
	JumpImg[1] = "http://www.t-com.ne.jp/banner/b_adsl_ohikkosi46860.gif";

	var JumpURL= new Array();
	JumpURL[0] = "http://www.t-com.ne.jp/campaign/adsl/cashback/index.html";
	JumpURL[1] = "http://www.t-com.ne.jp/campaign/common/adsl_hikkoshi/index.html";

	num = Math.floor(Math.random()*JumpURL.length);
	document.write("<a href=");
	document.write(JumpURL[num]);
	document.write(" target='_blank'>");
	document.write("<img src='"+JumpImg[num]+"' border='0'>");
	document.write("</a>");
}