function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function addCookieArray(name,value){
	var old=readCookie(name);
	if(old==null) old='';
	old=old.split('-');
	var add=true;
	for(var i=0;i<old.length;i++) if(value==old[i]) {
		add=false;
		break;
	}
	for(var i=0;i<old.length;i++) if(''==old[i]) {
		old.splice(i,1);
	}
	if(add) old.push(value);
	createCookie(name,old.join('-'),100)
}

function removeCookieArray(name,value){
	var old=readCookie(name);
	if(old==null) old='';
	old=old.split('-');
	var add=true;
	for(var i=0;i<old.length;i++) if(value==old[i]) {
		old.splice(i,1);
		break;
	}
	createCookie(name,old.join('-'),100)
}