// expires cookie after each session ///
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 banner_pop(URLToPop,WindowName,WindowParameters,WhereToPop,CookieName){

	//Pop-over only once per browser session? (0=no (load every time) , 1=yes (load once per session)///
	var once_per_session=1
	
	if (get_cookie(CookieName)==''){
		// pop under
		if(WhereToPop == "popunder"){
			pu = window.open(URLToPop, WindowName, WindowParameters)
			pu.blur();
			window.focus();
		}
		// pop up
		else{
		window.open(URLToPop, WindowName, WindowParameters)
		}
		document.cookie= CookieName + "=yes";
	}
}