WebDav and IE

Hi,

We want to use WebDav in IIS on a server to allow documents to be
viewed and modified on a client machine with MS Office installed.
However, we want everything to run inside the IE browser.
WebDav support seems to be work fine in MS Word when it is run
standalone. However, when MS Word is run from within the IE browser,
WebDav support seems to be missing.
How can we do this through the browser? Is there a 3rd party ASP.NET
or ActiveX control we could use?

Thanks,
Charles Gamble.