Prototype - form serialize problem

[raph0]

I have a form:

<form id="frm">
<fieldset>
<legend></legend>
 Imię:
<input type="text" id="name" />
Nazwisko:
<input type="text" id="surname" /><br />
</fieldset>
<fieldset>
<legend>Adres</legend>
Ulica:
<input type="text" id="street" />
Numer domu:
<input type="text" id="houseNumber" /><br />
Miejscowość:
<input type="text" id="city" />
Kod pocztowy:
<input type="text" id="zipPart1" size="2" /> - <input type="text"
id="zipPart2" size="3" /><br />
Telefon(fax):
<input type="text" id="phone" />
E-mail:
<input type="text" id="email" />
<input type="button" value="cos" id="cos" />
</fieldset>
<input type="submit" id='submitton' />
<input type="reset" />
</form>

I'm trying to serilize it like this:

var pars = $('frm').serialize();

or like this

var pars = $('frm').serialize(true);

and it dosen't work. :/ When i try display "pars" variable, shows nothing oraz something like [Object object] (2nd case).

[raph0]

I've already solved the problem. Attribute "name" was needed in controls.