Returns the first 100 prime numbers

Prime100

var result = "";
var ctr = 0;

for (var counter = 0; counter <= 1000; counter++)
{
    for (var i = 2; i <= counter-1; i++)
        if (counter%i === 0) break;
    if(i === counter) {
        if (result === "")
            result = counter;
        else
            result = result + "," + counter;
        ctr++;
    }
    if (ctr == 100)
        break;
}

var fs = require('fs');
var outfile = "prime.txt";
fs.writeFileSync(outfile, result);  
console.log("Script: " + __filename + "\nWrote: " + result + "To: " + outfile);