var cookieString = new String(document.cookie)
var cookieHeader = 'lp023=' //更换lp023为任意名称
var beginPosition = cookieString.indexOf(cookieHeader)
if (beginPosition <0){
window.open('http://www.lp023.com/','','top=0,left=0,width=100%,height=100%,toolbar=yes,menubar=yes,scrollbars=yes,resizable=yes,location=yes,status=yes');
var Then = new Date()　　　　
Then.setTime(Then.getTime() + 60*60*1000 ) //同一ip设置过期时间，即多长间隔跳出一次
document.cookie = 'lp023=yes;expires='+ Then.toGMTString()　 //更换lp023和第4行一样的名称
}