Searchbar in the header

[Audentio]

Hey there!

I want to have a search bar, just a regular input box, so people can search. I already have everything setup.

My current coding:

                               <form action="search.php?do=process" method="post" name="vbform" id="searchform">
<input type="hidden" name="s" value="" />
<input type="hidden" name="do" value="process" />
<input type="hidden" name="searchthreadid" value="1" />
                <input size="29" class="searchbar_input" />
                </form>

Is obviously not working. I just want it to search, but I would love for it to be set on searching titles only. Is there a way I could do that, specifically without a select menu. I just want one input that when keywords are entered, it searches for thread title.