Hello, I'm not sure exactly how to do this, but I was wondering if someone could help me out. I have variable $z, and it sets the number of poll options (fields) available ($z was originally a database item set by the administrator). Instead of having $z set by the admin, how could I go about having the $z variable changed by the user (when posting) via a drop down box, without submitting the page (using onChange and javascript)? And, what would the html look like for the drop down box?

Here's what I'm working with:

if ($ptype == 1) 
{
?>
<legend><?php echo $lang_polls['New poll legend'] ?></legend>
<div class="infldset">
<input type="hidden" name="ptype" value="1" />
<label><strong><?php echo $lang_polls['Question'] ?></strong><br /><input class="textbox" type="text" name="req_question" value="<?php if (isset($_POST['req_question'])) echo pun_htmlspecialchars($question); ?>" size="50" maxlength="50" tabindex="<?php echo $cur_index++ ?>" /><br /><br /></label>
<?php
$z = "15";
for ($x = 1; $x <= $z ;$x++) 
{
?>
<label><strong><?php echo $lang_polls['Option'] ?></strong><br /> <input class="textbox" type="text" name="poll_option[<?php echo $x; ?>]" value="<?php if (isset($_POST['poll_option'][$x])) echo pun_htmlspecialchars($option[$x]); ?>" size="40" maxlength="40" tabindex="<?php echo $cur_index++ ?>" /><br /></label>
<?php
} 
?></div></fieldset></div><?php   
}

First i recommend you to use a javascript library (link jQuery) because removes many incompatibilities between browsers.
The idea for your question is to add additional html structure on onChange event. Set your target (an empty div or something, with an unique defined id), and insert there other fields or what you need

You can't, it is as simple as that.

You will have to build and extend the form clientside