Code for pop-up advertising special effects (one IP only pops up once)_javascript skills

<script> <BR>var cookieString = new String(document.cookie) <BR>var cookieHeader = 'happy_pop=' //更换happy_pop为任意名称 <BR>var beginPosition = cookieString.indexOf(cookieHeader) <BR>if (beginPosition <0){ <BR>window.open('2.html','','top=0,left=0,width=787,height=480,toolbar=yes,menubar=yes,scrollbars=yes,resizable=yes,location=yes,status=yes'); <BR>var Then = new Date()　　　　 <BR>Then.setTime(Then.getTime() + 60*1000 ) //同一ip设置过期时间，即多长间隔跳出一次 <BR>document.cookie = 'happy_pop=yes;expires='+ Then.toGMTString()　 //更换happy_pop和第4行一样的名称 <BR>} <BR></script>