Observe_field internet explorer

Hi,
I have the following observe_field
which works in Firefox but doesn’t do anything in Internet Explorer …
as though it doesn’t exist.
How can I debug this in bloody MS world.
<%= text_field :drawing, :job_no, :title =>“Job ‘begins’”,
:autocomplete => “off”, :onclick => “$(drawing_job_no).value = ‘’;”%>
<%= observe_field ‘drawing_job_no’,
:url => {:controller => ‘admin’,
:action => ‘filter_result’},
:update => ‘rows’,
:frequency => 0.5,
:with => “‘drawing_job_no=’+value”
%>
Thanks
Bruce