To open an external site in a new screen, you can use one of the following plugins:

1. Open in New Window Plugin by Keith P. Graham – it will open external links in a new screen, keep your current screen open so you won’t lose where you left off.
   • WordPress Plugin:  http://wordpress.org/extend/plugins/open-in-new-window-plugin/
   • Plugin author’s site:  http://www.blogseye.com/
   • Download link from WordPress official site: http://downloads.wordpress.org/plugin/open-in-new-window-plugin.2.3.zip
2. Open external links in a new window by Kezze, Zap – will open the link starting with http:// or https:// in a separate window.
   • WordPress Plugin:  http://wordpress.org/extend/plugins/open-external-links-in-a-new-window/
   • Plugin author’s site:  http://kristianrisagerlarsen.dk/Direct link from
   • Download link from WordPress plugin center – http://downloads.wordpress.org/plugin/open-external-links-in-a-new-window.1.3.zip
3. More Coming soon!
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P.S.:  Keywords to search for the plugin and information:  open in new window, external link, open external link in new window, new window,…