want 8 spaces?
(new Array(8)).join(' ')
it's quick not only as in fewer keystrokes/less code, but is also blazingly fast to execute compared to a for-loop implementation.
Fireworks' export wizard seems to be plagued by filesize bugs. I thought they squashed them in CS3, but CS4 seems to have re-introduced or made a new one: it reports an exported file's size as Kilobytes = bytes/1000 instead of bytes/1024.
I just exported a file, noting that FW tells me it will be 754K, when in fact, it is 737K (754,807 bytes).