[JavaScript] Request

Is there a way to request the DOM of an another page?

Better yet, is there a way to know if the page that I will call will show
some error?

Here is my problem:

Im using a hiperlink of the Gtalk and MSN in my web site.
But if the user dont have Gtalk installed, the site show an error page that
is not much friendly.

The Skype has an JS verification, and works fine, if Gtalk and MSN had
too...

Tks.

PS: Here the code for Skype (
http://www.skype.com/share/buttons/advanced.html#detection)

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