How do I disable multiple listboxes in one go using jQuery?

Question

I can disable one and one by doing this:

jQuery('#ListBoxA').attr('disabled','true');

But how can I apply this to multiple items? This does not work:

jQuery('#ListBoxA, #ListBoxB, #ListBoxC').attr('disabled','true');

UPDATE

Not much markup to show....

<select id="ListBoxA" size="4" name="countrySelectBox">
<select id="ListBoxB" size="4" name="cityListBox">
<select id="ListBoxC" size="4" name="storeListBox" multiple="multiple">

Answer 1

jQuery('#ListBoxA,#ListBoxB,#ListBoxC').attr('disabled','disabled'); (Without white spaces).

To enable use jQuery('#ListBoxA,#ListBoxB,#ListBoxC').removeAttr('disabled');

http://docs.jquery.com/Selectors/multiple#selector1selector2selectorN