[ubuntu] Skype in repo

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http://ubuntuforums.org – If i try to download skype in my area the browser is redirected to skype.tom.com which has a modified version of skype. When i download it through synaptic, i have to enable the 3rd party option. In such a case when i install Skype through Synaptic do i get the original skype or its modified (tom) version ? How can i make out which version is installed on my system ? (Hardware)