Saving highscore in cookie

Yeah.

HTML

<FORM> 
    <INPUT type="button" value="Start" name="button3" onClick="game();">
    <INPUT type="button" value="Check cookie" name="button3" onClick="checkCookie();">
</FORM>
<td><textarea id="myTextarea">Your high score goes here</textarea></td>
<body onload="checkCookie()">

JavaScript

var record = 100;

function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1 ;
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return "";
}


function setCookie(c_name,value,expiredays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : "; expires="+exdate.toUTCString());
}

function checkCookie()
{
username=getCookie('username');
recordi=getCookie('Score');
if (username!=null && username!="")
  {
      alert(username+': '+recordi);
  }
else 
  {
  username=prompt('Please enter your name:',"");
  if (username!=null && username!="")
    {
    setCookie('username',username,365);
    }
  }
}


function addToTextArea(text) {
    var el = document.getElementById('myTextarea');
    el.value = text;
}

function game() {
    var guess = 0;
    var numberOfGuesses = 0;
    var rand_no = Math.random();
    rand_no = Math.round(rand_no * 10);

    guess = prompt("Insert your guess", "");
    numberOfGuesses += 1;

    while (guess != rand_no) {
                if (guess > rand_no) {
            guess = prompt("too big", "");
        }
        if (guess < rand_no) {
            guess = prompt("too small", "");
        }
        numberOfGuesses += 1;
    }
        if (numberOfGuesses < record) {
            record = numberOfGuesses;
        }

    alert("It took you " + numberOfGuesses + " guesses");
    addToTextArea("Your high score = " + (record));
    setCookie('Score',record,365);
}