[Kolyaj]

Number.prototype.pad = function(length) {
    var res = this.toString();
    while (res.length < length)
        res = '0' + res;
    return res;
};

for (var i = 0; i < 999; i++) {
     document.write(
      '<img src='+i.pad(3)+'.jpg><br><br>');
}