404 error showing blank page, Can i redirect 404 errors ?

[sukhman21]

Hi there,
i tried looking to see if someone already asked for this 404 error question

The files gets deleted after specified number of days for free users. Now when someone tries to download that file after its deleted, it just shows him a blank page and wont show any 404 page or anything.
I have created a 404 page in my theme directory but i am not able to redirect any 404 errors to that page.

I know it has to be specified in htaccess and i dd enter
ErrorDocument 404 /404.html

and also tried
ErrorDocument 404 http://www.#####.com/404.html

but doesnt work, it still keeps showing blank page for all 404 page errors.

Any way that i can redirect these 404 requests to my custom 404 page ??

Thanks