Can't Update My Database - mysql

Question

I can't update my database.. I wonder why it's not working while it worked on my other pages. I'm receiving this error:
You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version
for the right syntax to use near 'WHERE id =1' at line 4
This is the code:
<?php require_once("include/connect.php"); ?>
<?php require("include/bp_function.php"); ?>
<?php url(); ?>
<?php
$title = mysql_prep($_POST['title']);
$content = mysql_prep($_POST['content']);
$id = mysql_prep($_GET['aboutusid']);
$query = "UPDATE aboutus SET
title='{$title}',
content='{$content}',
WHERE id ={$id}";
mysql_query($query);
if(mysql_affected_rows() == 1) {
echo "Succesfully Updated {$title}
<br/>Go back to Backpanel";
} else {
echo "failed {$id}<br />".mysql_error()."<p> </p>";
}
?>
<?php require_once("include/footer.php"); ?>`
This is the form:
<?php require("include/connect.php"); ?>
<?php require("include/bp_function.php"); ?>
<?php url(); ?>
<?php include("include/bp_header.php"); ?>
<div id="bgcontainer">
<!-- NEWS CONTAINER -->
<div id="bodycont">
<div id="left_page">
<h2>About Us Menu</h2>
<?php list_of_aboutus(); ?>
<br />+ Add Menu
<hr />
</div>
<div id="right_page">
<h2>Edit: <?php echo $s_aboutus['title']; ?> </h2>
<br /><br />
<form action="query_editaboutus.php?aboutusid=<?php echo urlencode($s_aboutus['id']); ?>" method="post" enctype="multipart/form-data">
<table>
<tr valign="top"><td width="100px">Title:</td> <td><input name="title" type="name" size="45" value="<?php echo $s_aboutus['title']; ?>" /></td></tr>
<tr valign="top"><td width="100px">Content:</td> <td>
<textarea name="content" cols="45" rows="20" value="" > <?php echo $s_aboutus['content']; ?> </textarea>
<tr valign="top"><td width="100px">Update:</td><td><input type="submit" id="submit" value="Update" /></td></tr>
</table>
</form>
</div>
<!-- MEDIA CONTAINER -->
<?php include("include/footer.php"); ?>

Answer 1

Remove the comma after setting the content field.
$query = "UPDATE aboutus SET title='{$title}', content='{$content}' WHERE id ={$id}";
Original for comparison
$query = "UPDATE aboutus SET title='{$title}', content='{$content}', WHERE id ={$id}";

Answer 2

Check your update statement
$query = "UPDATE aboutus SET
title='{$title}',
content='{$content}'
WHERE id ={$id}";