XF 1.5 edting/adding to the "search" drop down box?

is there a way to modify (or more specifically, add to the content) of the drop down box that appears when you click the "search" box at the top right?

in our previous vbulletin installation we provided the option for users to search using the default vbulletin search feature (and the xenforo one works great, so i dont want to get rid of it at all)...but also use the google search page we have setup that allows the users to search across all of our domains using google (plus its extra monetization for adwords).

I dont need to add very much, just a link within the box that would take users to the google search page.