如何控制小窗口的弹出此数?

<script>
function openwin(){
window.open("page.html","","width=200,height=200")
} 
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 loadpopup(){
if (get_cookie('popped')==''){
openwin()
document.cookie="popped=yes"
}
}</script>
<body onload="loadpopup()">