i was installing [Ajax live search] in install instructions it says..
Code: 
[AJAX] Live Search, by mad@Max

Installation:
Import product :)

Upgrade
Uninstall the old version, delete files (if you has use it) and install new version.

If you alrady have opened search field, do following.
Search field look like this:

                <form action="search.php?do=process" method="post">

                    <input type="hidden" name="do" value="process" />
                    <input type="hidden" name="quicksearch" value="1" />
                    <input type="hidden" name="childforums" value="1" />
                    <input type="hidden" name="exactname" value="1" />
                    <input type="hidden" name="s" value="$session[sessionhash]" />
                    <input type="hidden" name="securitytoken" value="$bbuserinfo[securitytoken]" />
                    <input type="text" class="bginput" name="query" size="25" tabindex="1001" />
                    <input type="submit" class="button" value="$vbphrase[go]" tabindex="1004" />

                </form>
now where is the search field /?