Have you tried these add-ons-

GOOGLE SEARCH
Features= "A simple addon that lets you place a Google search box on your website. The block can be customised to search a specific website which you can define. You can set the target for the results as well so you can make the search results open in a new window."
http://www.concrete5.org/marketplace/addons/engagingit_googlesearch...

and..

FANCY AJAX GOOGLE SEARCH
Features= "This is seach block powered by google with results delivered with ajax.
You can search for in you site or wide web.
Search for web results, images, news and video.
Background color customizable.
Heading for result customizable (same as color for background)."
http://www.concrete5.org/marketplace/addons/fancy-ajax-google-searc...

The ajax one is maybe the right one for you.