MediaWiki: Tweeki-config-specialelements
From Tweeki
Use this array to add completely arbitrary code into navbars, subnav, sidebar, or footer. The value again is a callback function you need to create. It will be called with two arguments, the skin object and the context as a string (navbar-left, navbar-right, subnav, sidebar, footer). The function should directly print the html you want to have.