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(offset, end))
      }
   }
  return returnvalue;
}

function alertornot(){
if (get_cookie('alerted')==''){
		loadalert()
	document.cookie="alerted=yes"
	}
}

function loadalert(){
document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block';document.getElementById('spacer').style.display='block';
	if (document.all && document.createAttribute && document.compatMode != 'BackCompat') {
    	// IE6 (and above) in standards mode
		document.getElementsByTagName('html')[0].style.overflow = 'hidden'; // set to '' to show
	} else {
		document.body.style.overflow = 'hidden'; // set to '' to show
	}
}

function popup(){
if (once_per_session==0)
	loadalert()
else
	alertornot()
}

function closePopup(){
document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none';document.getElementById('spacer').style.display='none';
	if (document.all && document.createAttribute && document.compatMode != 'BackCompat') {
		// IE6 (and above) in standards mode
		document.getElementsByTagName('html')[0].style.overflow = ''; // set to '' to show
	} else {
		document.body.style.overflow = ''; // set to '' to show 
	}
}