popup with cookies... need to fix

Hi, I have a simple html website and I want that music would play in it. I decided to use a JS popup window. But I have one problem with my script. It has cookies with session:

<script type="text/javascript">
var popurls=new Array()

popurls[0]="music/dance.html"
popurls[1]="music/dj.html"
popurls[2]="music/hiphop.html"

function openpopup(popurl){
var winpops=window.open(popurl,"","width=370,height=10")
}
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(offset, end))
      }
   }
  return returnvalue;
}
function loadornot(){
if (get_cookie('jkpopup')==''){
openpopup(popurls[Math.floor(Math.random()*(popurls.length))])
document.cookie="jkpopup=yes"
}
}
loadornot()
</script>

Code (markup):

So, when the popup is loading it's ok. When I am going through pages which have the same popup link, the popup is not refreshing, which is also good. But when popup has a different link (for example "hiphop.html") it is not refreshing.

Is it possible to make a different link to work in this popup?