Posting inside the page in another form action? - php

Question

I am currenty having a thesis project which is the voting system, and my problem is how can I count the vote if I click on the radio button after I click the next button how to updates the votes?. And guys is it possible that in my php page I can save my data but the form action is not the saving part I mean like this
I have a form codes:
//preview page is the page where I can see all tha candidates that I have choose.
<form id="msform" action="preview.php" method="POST">
<?php
$resultasa = $db->prepare("SELECT * FROM candposition");
$resultasa->execute();
for($i=0; $rowasa = $resultasa->fetch(); $i++){
$exrxrxrx=$rowasa['pos_name'];
if($exrxrxrx=='President'){
?>
<fieldset>
<table>
<tr><td><h2 class="fs-title"><?php echo $rowasa['pos_name'] ?></h2></td>
<td><input name="<?php echo $rowasa['pos_name'] ?>" type="hidden" value="0" /></td>
</tr>
<?php
$YearNow=Date('Y');
$dsds=$rowasa['posid'];
$results = $db->prepare("SELECT * FROM candidates,student,school_year,partylist where student.idno = candidates.idno AND school_year.syearid = candidates.syearid AND posid =:a AND candidates.partyid = partylist.partyid AND school_year.from_year like $YearNow ");
$results->bindParam(':a', $dsds);
$results->execute();
for($i=0; $rows = $results->fetch(); $i++){
?>
<td><img src="admin/candidates/images/<?php echo $rows['image']; ?>" height="160px;" width="155px;"></td>
<td><br>
<div style="text-align:center">
<input name="pres" style="margin-left:-19px;" type="radio" value="<?php echo $rows['candid'] . "-" ."&nbsp". $rows['lastname']. "&nbsp". $rows['firstname'] ?>"> <?php echo $rows['lastname'] ?>,
<?php echo $rows['firstname'] ?>
- <?php
echo $rows['party_name']?>
<?php
//I think this part will be having an update like
$sql = "UPDATE candidates
SET votes=votes+?
WHERE candid=? ";
$q = $db->prepare($sql);
}
?>
<?php
}
?>