It's possible to shows tabs in the infowindow (version => 2.12k).

You can place in the text parameter the tags <tab></tab>. The content between the opening and closing of the tag will be used as content of a tab. You can give <tab> a attribute title and give the tab a title.

For example:

<tab title="Tab1">tab1 contents</tab><tab>tab2 contents</tab>

If you use directions, it will be placed as last tab

Don't place (double) quotes in the text. If you need a space in the linkTitle use "& nbsp;"

{mosmap text='<tab title="Tab1">tab1 contents</tab><tab>tab2 contents</tab>'|dir='1'}