convert all to absolute path extension

[zero]

I tried relativity extension. For some reason can't convert to absolute
filled the upper field with:

[url]http://www.mysite.com[/url]

clicked the button on right "absolute bla"

I get an alert

ingoring invalid site ur

What's wrong and how do I acomplish such a basic task?

Or is there other extension to do the same thing?

Thanks a lot in advance!