This is a sniplet of code that I use at the top of my pages for the search box.
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<form action='http://mydomainhere.com/myphpdigfolderhere/search.php' method='GET'>
<input type='hidden' name='template_demo' value='./templates/simple.html'/>
<input type='hidden' name='site' value='0'/>
<input type='hidden' name='path' value=''/>
<input type='hidden' name='result_page' value='index.php'/>
<input type='text' class='phpdiginputtext' name='query_string' value='' size="20"/>
<input type='submit' class='phpdiginputsubmit' name='search' value='Search'/>
</form>
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The real page is at
http://LakeNormansWeb.com
The code is inside a table to keep things aligned.