I have adapted a php contact form of David Powers tut

Hi I have slowly changed according to my research etc. I am worried that since changing things that I have left some important error checking.
Well here is the error checking and the form:
<h2><span class="black">contact us : </span></h2>

<span class="errmsg1">
<?php
if ($error) {
echo 'Please complete the missing item(s) indicated.';
// remove escape characters from POST array
if (get_magic_quotes_gpc()) {
function stripslashes_deep($value) {
$value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value);
return $value;
}
$_POST = array_map('stripslashes_deep', $_POST);
}
}
?>
</span>
<form name="option" id="option" method="post" action="<?php $_SERVER['PHP_SELF']; ?>">
<label> </label>
<table width="70%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>Your Name</td>
<td><input name="name" type="text" class="search" id="name" value="<?php if (isset($_POST['name'])) {
echo htmlentities($_POST['name']);} ?>" size="30" maxlength="50" /></td>
</tr>
<tr>
<td> </td>
<td><?php if (isset($error['name'])) { ?>
<span class="errmsg1"><?php echo $error['name']; ?></span>
<?php } ?> </td>
</tr>
<tr>
<td><span class="subheader">Your Email Address</span></td>
<td><span class="subheader">
<input name="email" type="text" id="email" value="<?php if (isset($_POST['email'])) {
echo htmlentities($_POST['email']);} ?>" size="30" maxlength="80" />
</span></td>
</tr>
<tr>
<td> </td>
<td><?php if (isset($error['email'])) { ?>
<span class="errmsg1"><?php echo $error['email']; ?></span>
<?php } ?> </td>
</tr>
<tr>
<td>Reason For Enquiry </td>
<td><label>
<select name="option">
<option value="">Please Select Option</option>
<option value="complaint"<?php
if (isset($error) && $_POST['option'] == 'complaint') { ?>
selected="selected"
<?php } ?>>Complaints</option>
<option value="listbusiness"<?php
if (isset($error) && $_POST['option'] == 'listbusiness') { ?>
selected="selected"
<?php } ?>>List My Business </option>
<option value="removelisting"<?php
if (isset($error) && $_POST['option'] == 'removelisting') { ?>
selected="selected"
<?php } ?>>Remove My Listing</option>
<option value="upgradelisting"<?php
if (isset($error) && $_POST['option'] == 'upgradelisting') { ?>
selected="selected"
<?php } ?>>Upgrade Listing</option>
<option value="banner"<?php
if (isset($error) && $_POST['option'] == 'banner') { ?>
selected="selected"
<?php } ?>>Banner Advertising</option>
<option value="agentenquiry"<?php
if (isset($error) && $_POST['option'] == 'agentenquiry') { ?>
selected="selected"
<?php } ?>>Become An Agent</option>
<option value="other"<?php
if (isset($error) && $_POST['option'] == 'other') { ?>
selected="selected"
<?php } ?>>Other</option>
</select>
</label></td>
</tr>
<tr>
<td> </td>
<td><?php if (isset($error['option'])) { ?>
<span class="errmsg1"><?php echo $error['option']; ?></span>
<?php } ?> </td>
</tr>
<tr>
<td>Message</td>
<td><label>
<textarea name="message" cols="30" rows="3" id="message"><?php if(isset($error)) {echo $messageBody;} ?>
</textarea>
</label></td>
</tr>
<tr>
<td> </td>
<td><?php if (isset($error['message'])) { ?>
<span class="errmsg1"><?php echo $error['message']; ?></span>
<?php } ?> </td>
</tr>
<tr>
<td> </td>
<td><label>
<input name="send" type="submit" class="searchbutton" id="send" value="Enquiry" />
</label></td>
</tr>
</table>
<label> </label>
<p><span class="subheader">
<label> </label>
</span></p>
</form>