how to replace my blog search box with google search

i searched google for nice and easy way to replace blogger template ( what ever) with google search box but i couldn't find any help
can any one help

I have a Google Adsense Search embedded into most of my blogs. It's as easy as any other Adsense Ad, to setup. The main thing you need is to be able to add a HTML gadget just above your Blogger Blog Post, in your Layout (see screenshot below).

Go to my blog & do a Search for "Blogger" in the Google Search textbox, upper right side of my page.
http://soswitcher.blogspot.com

The search results will open inside of my blog.

i know that but if you saw my blog i already have search box in my navigation bar i want to change it with google search box to make it looks natural and pretty
i saw many guys doing this trick specially guys who are using Revolution church blogger template
you will see google search bar instead of regular template search, it looks so cool

You need to replace this in your template with your adsense search code.. but make sure.. your adsense search fits the navbar perfectly..otherwise..it looks like crap.

  Code:

<form action='/search' id='searchform' method='get'>
<input id='s' name='q' type='text' value=''/>
<input id='searchsubmit' type='submit' value=''/>
</form>


many thanks Kranthi