New content notifier in Javascript

now = new Date
expireDate = new Date
expireDate.setMonth(expireDate.getMonth() 6)
lastVisit = new Date(cookieVal("pageVisit"))
document.cookie = "pageVisit=" now ";expires="   expireDate.toGMTString()

function cookieVal(cookieName) {
  thisCookie = document.cookie.split("; ")
    for (i=0; i<thisCookie.length; i  ) {
      if (cookieName == thisCookie[i].split("=")[0]) {
        return thisCookie[i].split("=")[1]
      }
    }
  return "1 January 1970"
}

function newCheck(yyy,mm,dd) {
  lastChgd = new Date(yyy,mm-1,dd)
  if (lastChgd.getTime() > lastVisit.getTime()) {
    document.write("<img src='/img/new-to-you/new.gif' alt='new'>")
  }
}

<html>
<head>
  <title>kurapa.com test</title>
  <script type="text/javascript" src="newYou.js"></script>
</head>
<body>
<script type="text/javascript" language="JavaScript"> newCheck(2005,2,11)</script> Be sure to check out our new scripts!
<br>
<script type="text/javascript" language="JavaScript"> newCheck(2005,2,3)</script> Have you seen our Tutorials?
</body>
</html>