Cookie Welcome Back

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This uses a cookie to know if this is a first time visitor.

Body Code:

<script type=text/javascript>
// cookie construct

function Cookie(document,name,hours,path,domain,secure) {
  // any VAR in "this" that does not start with a "$" will
  // be written into the cookie (read from also)
  this.$doc  = document
  this.$name = name
  if (hours)  this.$expiration=new Date((new Date()).getTime()+hours*3600000); else this.$expiration = null
  if (path)   this.$path   = path;                                             else this.$path       = null
  if (domain) this.$domain = domain;                                           else this.$domain     = null
  if (secure) this.$secure = true;                                             else this.$secure     = false
}

function CookieWrite() {
  var cookieval=""
  for(var prop in this) {
    if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function') || prop == '') continue
	if (cookieval != "") cookieval += '&'
	cookieval+=prop+":"+escape(this[prop])
  }
  var cookie=this.$name+"="+cookieval
  if (this.$expiration) cookie+='; expires=' + this.$expiration.toGMTString()
  if (this.$path)       cookie+='; path='    + this.$path
  if (this.$domain)     cookie+='; domain='  + this.$domain
  if (this.$secure)     cookie+='; secure'
  this.$doc.cookie=cookie
}

function CookieRead() {
  var allcookies=this.$doc.cookie
  if (allcookies=="") {
    return false
  }
  var start= allcookies.indexOf(this.$name+'=')
  if (start== -1) {
    return false
  }
  start += this.$name.length+1
  var end=allcookies.indexOf(';',start)
  if (end == -1) end=allcookies.length
  var cookieval = allcookies.substring(start,end)
  var a = cookieval.split('&')
  for (var i=0;i<a.length;i++) a[i]=a[i].split(':')
  for (var i=0;i<a.length;i++) this[a[i][0]]=unescape(a[i][1])
  return true
}

function CookieDelete() {
  var cookie = this.$name+'='
  if (this.$path)   cookie+='; path='+this.$path
  if (this.$domain) cookie+='; domain='+this.$domain
  cookie+='; expires=Fri, 02-Jan-1970 00:00:00 GMT'  // MAKE IT EXPIRE!
  this.$doc.cookie=cookie
}

new Cookie()
Cookie.prototype.write = CookieWrite
Cookie.prototype.del   = CookieDelete
Cookie.prototype.read  = CookieRead

// end cookie construct

var myCookie = new Cookie(document,"myName",240)
if (!myCookie.read() || !myCookie.name) {
  myCookie.name=prompt("Hi first timer, what is your name:","")
}
myCookie.write()
var _name = myCookie.name?myCookie.name:'Unknown User'
document.write('Your cookie told me your name was: '+_name)
function changeName() {
  myCookie.name=prompt("Enter New Name:","");
  if(myCookie.name==null) myCookie.name='Unknown User';
  myCookie.write();
}
</script>
<BR><a href="javascript:document.location=document.location">Reload this page (read the cookie)</a>
<BR><a href="javascript:changeName()">Change the name in the cookie</a>
<BR><a href="javascript:myCookie.del()">Click Me To Delete This Cookie</A>

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