<SCRIPT language=javascript>
    function defaultwin(){
    var exitwin,url,ownwin;
    url = 'index.asp'; //修改为你要做弹窗的网址
    exitwin = window.open(url,'LITcn');}
    function get_cookie(Name) {
    var search = Name + '='
    var returnvalue = '';
    if (documents.cookie.length > 0) {
    offset = documents.cookie.indexOf(search)
    if (offset != -1) {
    offset += search.length
    end = documents.cookie.indexOf(';', offset);
    if (end == -1)
    end = documents.cookie.length;
    returnvalue=unescape(documents.cookie.substring(offset, end))
    }
    }
    return returnvalue;
    } [转自：711网络工作室 http://www.tc711.com]

    function loadpopup(){
    if (get_cookie('popped')==''){
    defaultwin()
    documents.cookie='popped=yes'
    }
    }
    window.onload=loadpopup;
    </SCRIPT>