Sunray,
I wouldn't bother with the Plug Adapter shown in your link, as it's cumbersome and expensive.
For the countries you'll be visiting, use the www.magellans.com/store/Adaptor_Plugs___Converters___Plug_AdaptorsEA351D?Args=. The grounding pin of the Laptop Plug should fit along the side of this (of course, it won't provide the grounding function).
If you'd prefer to have a grounding connection for the Laptop, you'll probably have to purchase two different types of European Plug Adapter. The Italian style has three round in-line pins (Style 'I' on the Magellan's website), while the German and Austrian model is different (Style 'D' on the Magellan's website).
You can purchase inexpensive Plug Adaptors at Magellan's, Radio Shack, probably Wal-Mart, travel and luggage shops and REI Dallas (4515 LBJ Fwy, open 10AM-9PM Mon-Sat). REI have the basic two-pin European model for $3.
I'd suggest travelling with at least two Plug Adapters. Note that if you'll be passing through the U.K., a different style Adapter will be required.
Cheers!