Does sparkweb work through an http proxy?

can someone tell me if sparkweb will work through an http proxy server, like an outbound http proxy server as part of a corporate firewall?

specifically, does the flash plugin utililze the proxy settings from the browser (IE)?

Are there any other recommendatations on how to access the openfire server from behind corporate firewalls that only allow outbound traffic through the http proxy?

It looks to me like the Spark client will use an http proxy, but only for port 5222, which I assume uses the CONNECT method through the proxy, which I believe is also blocked.

thanks

Lee