jquery css selectors ie

the following works firefox, nonetheless breaks ie7 & 8:

$("#my-first-div, #my-second-div").hide();

so i have this:

$("#my-first-div").hide();
$("#my-second-div").hide();

is normal?

edit: ok, tangible real-life formula this:

$("#charges-gsm,#charges-gsm-faq,#charges-gsm-prices").html(html);

and blunder this

( ie8): message: 'nodename' zero an object
  line: 19 char: 150 code: 0
  uri: http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js

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