>Any value over 32 means the call succeeded and the URL was probably alright. You can't tell whether the page loaded though. If hte URL is bad (ie malformed) the error will occur immediately, but if the page fails to load because the server is down, it will still return OK because the browser is run async.
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>You can use the IE application object instead. There you can check for document complete events etc.

I'll apply a basic verification by the use of the 32 value as I also need to check for a mailto syntax.