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I was thinking of simular function to the Weblog for a while, and find this great service today.
When you do a Mouse-over on an external link, a preview snap box will be prompt for user to decide where to go. (Actually preview of internal link can be enable by setting si=1, but currently it is not enable.)
The “Snap Preview Anywhere” service is free and easy to install, heads off snap and regist for a key, insert a line of HTML code to your source will do! (Nice AJAX there!)
If you like it, give it a try!
Snap – Get Snap
Snap – Snap Preview Anywhere FAQ