Using Ajax and FireFox

Hi all,
   I have created a new application 1month ago. In that
application i 
have a link Add New. This link is given using Ajax(<%=
link_to_remote( 
'Add New',
                             :update =>
"abc",
                             :url =>{
:controller=>"xyz",:action => 
:new},
                             :position =>
"after" ) %>)

and also i gave   <%= javascript_include_tag
'prototype' %> to define 
ajax.
It worked good and i'm using that application since 1
month.

But today when i click on add new i'm not getting the form.
Its giving 
an error "Ajax not defined".Even its not working
in my local 
machine.(all these things,i'm doing using FireFox).

So i tried in IE. Its working properly. So what might be the
problem?
 Why its not working in Firefox??

Thanks and Regards,
Harish

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