Search Engines Plug in?

Well, it is very easy to create the urls for command line:
1) Open <!-- m --><a class="postlink" href="http://images.google.com/">http://images.google.com/</a><!-- m -->
2) write some text in the search textbox and press enter (I've typed the "test")
3) Look at the text in the address box of the browser. After typing the test I get:

Code:

http://images.google.com/images?hl=en&q=test&btnG=Search+Images&gbv=2

4) Now we replace our text "test" with the placeholder %s:

Code:

http://images.google.com/images?hl=en&q=%s&btnG=Search+Images&gbv=2

This is the url we are looking for