Because we need to upload a file. Only firefox 3.5 support XHR file 
uploads. The rest of the browsers have to target an iframe to not cause 
the page to refresh.

--michael

Roan Kattouw wrote:
> 2009/8/15 Michael Dale <[email protected]>:
>   
>> This is needed for iframe target background upload tasks. ie you upload
>> a file and then you want to take the name of the file you uploaded and
>> use that to insert the image into the edit window. With mime as
>> "application/json" the browser promts the user to "save" the file and we
>> can't eval the document text result in the iframe.
>>
>>     
> Why use an iframe? Why not something like $.post(), or if that doesn't
> upload properly, build a form and submit it?
>
> Roan Kattouw (Catrope)
>
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