Guest,
:with=>"'addr=' + escape($F('company.id')) "
Keep in mind that this string you are passing is entirely JavaScript. company.id is a ruby expression, and only confuses your poor JS interpreter which knows nothing of ruby.
Try this:
:with=>"'company_id='+#{company.id}"
Then ruby will insert the value of company.id as a string, which gets passed to JS, serialized with the form, becomes part of the AJAX request, etc. The value of company.id should arrive at the action as params[:company_id].
<rant> Again we run into the same paradox: IE is the worst environment in which to try to debug JS (seriously, you'd be better off debugging JS at a rave, or underwater, or in a dark closet . . . its making me queasy just thinking about it), and yet there are tons of quirky, subtle IE-specific JS problems lurking out there. IE is bad! </rant>
Cheers, Blake Miller