placing the search box of google

hi ya .. i want to place the google AdSense for Search on my forum below the welcome box..that it wud comes at every page of forum. i have phpbb version 2.0 installed, i dont knw where to put the code in template editing, to put the google adsense for search box in right place..can any body plz tell me thanks

see the arrow+red box where i want to place it in screenshot below:

You can do it with models

which models?

What he ment was templates.
But you will need to add it in every template wich has that part... wich are like 7 or more. not sure

can u plz figure which templates in template is it overall header? if yes then plz tell me in cooding where should i put the code to put it on that specific area which i figured above in the screenshot

bumppppppppppppppppppp ...plz help

Templates -> General -> overall_header_new
Scroll all the way down and there you shud be able to see this at the end

Code:

<!-- BEGIN html_validation -->
                                    </div>
                                 </div>
                              </div>
                           </div>
                        </div>
                     </div>
                  </div>
               </div>
            </div>
         </div>
      </div>
   </div>
</body>
</html>
<!-- END html_validation -->

you can place it above BEGIN html_validation.
Then it shud appear just between your navbar and forum content

thanks alot