JavaScript find first 10.000 prime numbers

<html>
<head>
<script type="text/javascript">
/*
  Original Python version http://pastebin.com/qgEnH9HE
  JavaScript by pumpy
*/
var primes = [];
var m = [1, 3, 7, 9];

function prime(n){
    for (var i = 0; i < primes.length; i++)
        if ((primes[i] <= Math.round(Math.sqrt(n)) + 1) && (n % primes[i] == 0))
            return false;
    return true;
}

function run(){
    var i = 2, d = 1;
    while (primes.length < 10000) {
        while (i < 10){
            if (prime(i))
                primes.push(i);
            i++;
        }
        for (var n = 0; n<4; n++){
            i = d * 10 + m[n];
            if (prime(i))
                primes.push(i);
        }
        d++;
    }
}

console.log("Working ...");
var start = Date.now();
run();
var stop = Date.now();
console.log("Done!");
console.log(primes);

var message = "It took:" + parseFloat(stop - start) + "ms to find 10.000 primes.";
console.log(message);
alert(message);
</script>
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</html>