只弹出一次的弹出广告代码

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  <SCRIPT language="JavaScript">
<!--
function openpopup(){
url="attention.php"
window.open(url,"欲海沉沦公告","width=468,height=300,left=100,top=100")
}

function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset);
if (end == -1)
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}

function helpor_net(){
if (get_cookie('popped')==''){
openpopup()
document.cookie="popped=yes"
}
}
helpor_net()
//-->
</SCRIPT>

黑狼

无聊早又了 怎么1来就开这么多主题发无聊东西 ！``