howto disable the file upload element

"Acker, Masaf" <[email protected]>
Newsgroups gmane.comp.mozilla.devel.prefs
Organization T-Online
Message-ID <[email protected]> 
hi,

how can I disable the file upload element? Is there the posiblity to 
remove it global per css? (I'm going to set up an kiosk browser..the 
problem is: by clicking on : "browse..." the file picker opens. I 
searched in /chrome/browser.jar->browser.js for a function, which 
handels this event, but there is none.

thx
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