XMLHttpRequest Security errors

Hey /prog/, not a regular but I thought I'd try you guys - I'm running into problems when I try to load cross-board content using xmlhttprequest. Apparently it only works in the same domain, so I get security errors when a link pointing to img wants to load content from dat (the cross-board links send you to a redirecting page which does this). Any ideas on how to work through this? I'm running the code through the Greasemonkey Firefox extension. Thanks!

>>19
Client-side hashing and cryptographic nonces. There is absolutely no reason passwords have to travel over the network.
Ask Xarn, he knows about crypto.^[1]

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References:
^[1] http://muffins.rotahall.org/forums/topic.php?id=6