One Pop-Up Per Visitor Script

var popunder="/pu.html"
var winfeatures="width=468,height=80,scrollbars=0,resizable=0,toolb  ar=0,location=0,menubar=0,status=0,directories=0"
var once_per_session=1
function get_cookie(Name) {
  var search = Name + "="
  var returnvalue = "";
  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 == -1)
         end = document.cookie.length;
      returnvalue=unescape(document.cookie.substring(off  set, end))
      }
   }
  return returnvalue;
}

function loadornot(){
if (get_cookie('popunder')==''){
loadpopunder()
document.cookie="popunder=yes"
}
}
function loadpopunder(){
win2=window.open(popunder,"",winfeatures)
win2.blur()
window.focus()
}
if (once_per_session==0)
loadpopunder()
else
loadornot()