如何在搜索部分重新加载div?

I'm making a social network website where the users can confirm and cancel their attendance to a certain event. While this is already working, the problem is that every time a user confirm or cancel their attendance, the whole page reloads while I want only the confirmation div to reload.

<!-- The search results are displayed here -->
<div class="col-md-8 col-lg-7" id="vomeio" style="background-color: snow;"> 
    <div class="page-header"><center> <h3> Resultados da pesquisa: </h3></center></div> 
    <?php include "search.php" ?>
    <br><br><br><br>
    </div>
</div> 

search.php

echo '<div class="container"><img class="pull-left" height="317px" width = "422px" src="home/'.$linha['image'].'"/>';
echo "<p><div id=\"resultado\"><strong>Confirmados: $confirmados</strong></div></p>"; //this is the div I want to reload.
if ($groxa==0) {

    echo "<form id=\"resultar\" method=\"post\" action=\"confirm.php?codigo=$codigo\"><p><input type=\"submit\" value=\"Confimar presença\"></p></form>"; //if you havent already confirmed your attendance, this displays the confirm button.

}

confirm.php

//if your attendance is confirmed 
print("<script>alert(\"Confirmado com sucesso.\")</script>");
print("<meta http-equiv=\"refresh\" content=\"0;searchpage.php\">");

I know the http-equiv part is reloading the whole search page (without the results displayed ofc) but I want only the confirmation div related to the event to update. Is there a way?