jQuery: load txt file and insert into div

I want to load a *.txt file and insert the content into a div. Here my code:

js:

$(document).ready(function() {
    $("#lesen").click(function() {
        $.ajax({
            url : "helloworld.txt",
            success : function (data) {
                $(".text").html(data);
            }
        });
    });
}); 

html:

<div class="button">
    <input type="button" id="lesen" value="Lesen!" />
</div>

<div class="text">
    Lorem Ipsum <br />
</div>

txt:

im done

If i click on the button firebug report following error:

Syntax-Error
im done

I don´t know what to do :-(