Open New Tab Option in Custom Context Menu

I am trying to make a custom context menu so that when a user right clicks it replaces the original right click menu. I can get that bit working but I don't want to do away completly with all the browser features. In particular I want to include a "open in new tab" option in my new menu so that users may open links in a new tab, however I cannot seem to find any information on google on how to do this.

I need it to be cross browser compatible at least IE/FF friendly. Does anyone know how to do this or have a link to a tutorial?

Also is it possible to completly replicate the original menu, but use a custom context menu to change the look/design of it with css?

http://deluxe-menu.com/popup-mode-sample.html
http://www.milonic.com/menusample27.php
http://www.javascriptkit.com/script/script2/rightclickmenu.shtml

Thx but those links just show me how to make a custom context menu I already know how to do that. I want to know though how to add a "open in new tab" option for my custom context menu :)

Which one are you using?

Could you not implement it so it acts the same was as you do:

<a href="http://www.google.com" target="_blank">Open Google in new window</a>