Rails - Aug 2007 - observe_field not working with Internet Explorer

I have the following observe field in one of my rhtml files:

<%= observe_field("order_plan", :frequency => 0.2, :url =>
{:action =>
:update_list}, :with => "id") %>

this works fine in firefox but Internet Explorer (6 and 7) causez my
code to fail.
For some reason when the observe_field calls the update_list it passes
the value of null for id

..., "id"=>"null", ....

Does anybody know why Internet explorer is doing this?

Thanks,
James
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the mystery continues. I got rid of the observe field and changed it to 
an onchange event in the select item but it still does the same.

Although i did notice it only returns null the first time, any further 
onchange events cause the right id to be passed.

has anybody else has a similar problem?

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