function setCookie(name, value, expires, path, domain, secure) {
  document.cookie= name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) {return "";}
  } else {
    begin += 2;
  }
  var end = document.cookie.indexOf(";", begin);
  if (end == -1) {
    end = dc.length;
  }
  return unescape(dc.substring(begin + prefix.length, end));
}

function addToList(id) {
   setCookie("propList", getCookie("propList") + ":" + id);
   alert("This property has been added to your watch list");
}