Edit page using php/mysql - php

Question

I seem to be having problems with editing a users/members information. I have provided the scipt with the form below. Any solution to this is very much appreciated. I have taken out the validation checks to shorten the script.
The page renders with no errors. and the success message is being shown. However, information is not being changed/edited in the database.
Also the values from the database (corresponding to the 2nd db query being run) are being displayed in the fields of the form. However when i POST the changes the changes are not being made in the database.
**PHP scipt**
<?php
session_start();
if (isset($_SESSION['id'])) {
$id = $_SESSION['id'];
$username = $_SESSION['username'];
}
else {
echo "You have not signed in";
}
if (isset ($_POST['submit'])){
$title = $_POST['title'];
$content = $_POST['content'];
$make= $_POST['make'];
$model = $_POST['model'];
$price = $_POST['price'];
$location = $_POST['location'];
include_once "scripts/connect_to_mysql.php";
$title = mysql_real_escape_string($title);
$content = mysql_real_escape_string($content);
$make = mysql_real_escape_string($make);
$model = mysql_real_escape_string($model);
$price = mysql_real_escape_string($price);
$location = mysql_real_escape_string($location);
$title = eregi_replace("`", "", $title);
$content = eregi_replace("`", "", $content);
$make = eregi_replace("`", "", $make);
$model = eregi_replace("`", "", $model);
$price = eregi_replace("`", "", $price);
$location = eregi_replace("`", "", $location);
$sql = mysql_query ("UPDATE `advertisements` SET `title`='$title',
`content`='$content', `make`='$make', `model`= '$model', `price`='$price',
`location`='$location', `id`='$id' WHERE `advertisements` . `ads_id`='$ads_id'")
or die (mysql_error());
$success = "You have successfuly edited your ad";
}
else {
if (isset($_GET['ads_id'])) {
$ads_id = $_GET['ads_id'];
}
else {
echo "URL not found";
}
include_once "scripts/connect_to_mysql.php";
$query = mysql_query("SELECT * FROM advertisements WHERE ads_id='$ads_id'");
while($row = mysql_fetch_assoc($query))
{
$title = $row["title"];
$content = $row["content"];
$make = $row["make"];
$model = $row["model"];
$price = $row["price"];
$location = $row["location"];
$ads_id = $row ["ads_id"];
}
}
?>
**form**
<h1>Edit Advertisement</h1>
<?php echo "$success";?>
<form action="edit.php" method="POST" enctype="multipart/form-data">
Title: <input name="title" type="text" value="<?php print "$title"; ?>"/><br/>
Content: <input name="content" type="text" value="<?php print "$content";
?>"/><br/>
Make: <select name="make">
<option value="<?php echo "$make"; ?>"><?php echo "$make"; ?></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select> <br/>
Model: <select name="model">
<option value="<?php echo "$model"; ?>"><?php echo "$model"; ?></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select> <br/>
Price: <input name="price" type="text" value="<?php print "$price"; ?>"> <br/>
Location: <select name="location"> <br/>
<option value="<?php echo "$location"; ?>"><?php echo "$location";
?></option>
<option value="Leicester">Leicester</option>
<option value="Loughborough">Loughborough</option>
<option value="Nottingham">Nottingham</option>
<option value="Derby">Derby</option>
</select> <br/> <br/>
<input name="submit" type="submit" value="Edit ad"/>
</form>

Answer 1

try moving the
if (isset($_GET['ads_id'])) {
$ads_id = $_GET['ads_id'];
}
else {
echo "URL not found";
}
to the top right after the
if (isset ($_POST['submit'])){
this may cause problems
and your form action as i guess must have something like
<form action ="edit.php?ads_id=the id for the page" >