With this widget you quickly add a searchfield to your site.
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User searches on either your site or on the entire web.
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Web,image,news,video search types
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Uses Google as search engine
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Hits are shown via ajax, "more" button to load more results
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Fully Customizable css - Easy to install
http://www.yiiframework.com/extension/googlesearch/
Support & Questions here
Demo
Github
*Edit I also added a custom bootstrap look example.