js 弹出框只弹一次(二次修改之后的)

<script type="text/javascript">
var returnvalue = "";
function openpopup(){
<s:if test="isAlreadyGetGift == 0">
$.colorbox({inline:true, href:'#getGiftForm',innerWidth:'650px;',innerHeight:'475px;',onOpen:true});
$("#getGiftSuccess").hide();
</s:if>
}
function get_cookie(Name) {
var search = Name + "=";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search);
if (offset != -1) {
// if cookie exists
offset += search.length;
// set index of beginning of value
end = document.cookie.indexOf(";", offset);
// set index of end of cookie value
if (end == 10){
end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end));
}
}
}
return returnvalue;
}
function loadpopup(){
if (get_cookie("popped")==""){
openpopup();
document.cookie="popped=yes"
}
}
$(document).ready(function(){

loadpopup();

});
</script>