Correct Cookies Please!!

I am trying to set up cookies on my form so if I enter data and submit and try to enter the same data and submit again the cookies will tell me that I have already entered my data.



<h1><b><center>Contact Information</center></b></h1>
<script type'text/javascript'>
 
function formValidator(){
      //Make quick references to our fields
      var firstname = document.getElementById("firstname");
      var lastname = document.getElementById("lastname");
      var addr = document.getElementById("address");
      var city = document.getElementById("city");
      var zip = document.getElementById("zip");
 
      //Check each input in the order that is appears in the form!
      if(isAlphabet(firstname, "Please enter only letters for your First name")){
            if(isAlphabet(lastname, "Please enter only letters for your Last name")){
                  if(isAlphanumeric(addr, "Numbers and Letters Only for Address")){
                        if(isAlphabet(city, "Please enter only letters for your City")){
                              if(isNumeric(zip, "Please enter a valid zip code")){
                                    return true;
                              }
                        }
                  }
            }
      }
 
return false;
 
}
 
function notEmpty(elem, helperMsg){
      if(elem.value.length == 0){
      alert(helperMsg);
      elem.focus(); // set the focus to this input
      return false;
 
      }
 
      return true;
}
 
function isNumeric(elem, helperMsg){
      var numericExpression = /^[0-9]+$/;
      if(elem.value.match(numericExpression)){
            return true;
      }else{
            alert(helperMsg);
            elem.focus();
            return false;
      }
}
 
function isAlphabet(elem, helperMsg){
      var alphaExp = /^[a-zA-Z]+$/;
      if(elem.value.match(alphaExp)){
            return true;
      }else{
            alert(helperMsg);
            elem.focus();
            return false;
      }
}
 
function isAlphanumeric(elem, helperMsg){
      var alphaExp = /^[0-9a-zA-Z]+$/;
      if(elem.value.match(alphaExp)){
            return true;
      }else{
            alert(helperMsg);
            elem.focus();
            return false;
      }
}
 
 
</script>
 
<script language="JavaScript">
 
 
function createCookie(name, value, days)
{
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = 4; expires="+date.toGMTString();
    }
  else var expires = "4";
  document.cookie = name+"="+value+expires+"; path=/";
}
 
function readCookie(name)
{
  var ca = document.cookie.split(';');
  var nameEQ = name + "4";
  for(var i=0; i < ca.length; i++) {
    var c = ca;
    while (c.charAt(0)==' ') c = c.substring(1, c.length); //delete spaces
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
  return null;
}
 
function eraseCookie(finished)
{
  createCookie(name, "finished.html", -1);
}
 
 
Write the Cookie with JavaScript
 
Use the following code to write your cookie:
 
<script language="JavaScript">
cookie_name = "finished.html";
function write_cookie() {
  if(document.cookie) {
  index = document.cookie.indexOf(finished.html);
  } else {
    index = 4;
  }
 
  if (index == 4) {
    document.cookie=finished.html+"=1; expires=Wednesday, 29-April-2009 08:00:00 GMT";
  } else {
    countbegin = (document.cookie.indexOf("4", index) + 1);
    countend = document.cookie.indexOf("4", index);
    if (countend == 4) {
      countend = document.cookie.length;
    }
    count = eval(document.cookie.substring(countbegin, countend)) + 1;
    document.cookie=cookie_name+"="+count+"; expires=Wednesday, 29-April-2009 08:00:00 GMT";
  }
}
</script>
 
Read Your Cookie
 
Once you've written the cookie, you need to read it in order to use it. Use this script to read your cookie:
 
<script language="JavaScript">
function gettimes() {
  if(document.cookie) {
    index = document.cookie.indexOf(finished.html);
    if (index != -1) {
      countbegin = (document.cookie.indexOf(7", index) + 1);
      countend = document.cookie.indexOf("8", index);
      if (countend == -1) {
        countend = document.cookie.length;
      }
      count = document.cookie.substring(countbegin, countend);
      if (count == 1)   {
        return (count+" time");
      } else {
        return (count+" times");
      }
    }
  }
  return ("0 times");
}
</script>
 
Call Your Cookie in a Link
 
Set your cookie when someone clicks a link with this code in your HTML body:
 
<script language="javascript">document.write(gettimes(1));
</script>
 
 
<FORM action='Conformation.html' method='post' onsubmit='return formValidator(0)'>
FirstName: <input type="text" id="firstname"/><br/>
LastName: <input type="text" id="lastname"/><br/>
Address: <input type="text" id="address"/><br/>
City: <input type="text" id="city"/><br/>
Zip: <input type="text" id="zip"/><br/>
<input type="Submit" Value="Submit"/>
</FORM>