Please can somebody help me with this script.

I'm developing a property website where the client can add a property to the database using the following script:

PHP Code:
<?php
    $topPage 
"siteContent/index";
    require_once 
"menu.php";

    if(
$_POST['submit']) {
        
// Strip out the crap
        
foreach($_POST as $key=>$value) {
            
$formData[$key] = mysql_escape_string($value);
        }
        
array_pop($formData); // Get rid of the submit button value

        // Check that the title and content are not empty
        
if(($formData['ref'] != "") and ($formData['location'] != "")) {
            
$formData['created'] = strtotime($formData['created']);

            
// Check if we are updating or inserting a new user
            
if($formData['id']) {
                
mysql_query("UPDATE properties SET created = FROM_UNIXTIME(" $formData['created'] . "), ref = '" $formData['ref'] . "', fulldescription = '" $formData['fulldescription'] . "', price = '" $formData['price'] . "', location = '" $formData['location'] . "', town = '" $formData['town'] . "' WHERE id = " $formData['id']);
            } else {
                
mysql_query("INSERT INTO properties (ref, fulldescription, price, location, town, created) VALUES ('" $formData['ref'] . "', '" $formData['fulldescription'] . "', '" $formData['price'] . "', '" $formData['location'] . "', '" $formData['town'] . "', FROM_UNIXTIME(" $formData['created'] . "))");
                
$formData['id'] = mysql_insert_id();
            }            
            
$_POST['fileName'] = time();

            
// Check that the name is not empty
            
$imageName basename($_FILES['newPicture']['name']);
            
$extension strtolower(substr($imageNamestrlen($imageName) - 3));
            if(
$extension == "peg"$extension "jpg";
                
            
$destination DOCUMENT_ROOT STATIC_IMAGES_DIR "/" "property" $formData['id'] . "." $extension;
    
            if(
$_FILES['newPicture']['name'] != "") {
                if(
move_uploaded_file($_FILES['newPicture']['tmp_name'], $destination)) {
                    
chmod($destination0777);
                    
mysql_query("UPDATE properties SET ext = '" $extension "' WHERE id = " $formData['id']);
                }
            }

            
doJSRedirect("properties.html""");
            
$STOP_DISPLAY true;
        } else {
            
doMessage("warning""<strong>You must enter a reference and location for this letting.</strong><br/>Please complete the missing information below and click 'Save'.");
        }
    } else {
        
$requestURI end(explode("id="$_SERVER['REQUEST_URI']));
        if(
strip_tags($requestURI) != "") {
            if(
$lettings mysql_query("SELECT *, UNIX_TIMESTAMP(created) AS created FROM properties WHERE id = " $requestURI)) {
                
$formData mysql_fetch_assoc($lettings);
            } else {
                
$formData['created'] = time();
            }
        }
    }

    if(!
$STOP_DISPLAY) {
?>
        <h2>Edit Letting</h2>
        <form class="editForm" method="post" action="<?php echo $_SERVER['REQUEST_URI']; ?>" enctype="multipart/form-data">
            <input type="hidden" name="id" value="<?php echo $formData['id']; ?>"/>
            <input type="hidden" name="created" value="<?php echo niceDate($formData['created']); ?>"/>

            <label>Ref</label>
            <input class="text" type="text" name="ref" value="<?php echo $formData['ref']; ?>"/>

            <label>Street</label>
            <input class="text" type="text" name="location" value="<?php echo $formData['location']; ?>"/>

            <label>Town/City</label>
            <input class="text" type="text" name="town" value="<?php echo $formData['town']; ?>"/>
<div></div>
            <label>Image</label>
            <input type="file" name="newPicture" id="newPicture"/>
<div></div>
            <label>Price per month</label>
            <input class="text" type="text" name="price" value="<?php echo $formData['price']; ?>"/>
<div></div>
            <label>Full description</label>
            <textarea name="fulldescription"><?php echo $formData['fulldescription']; ?></textarea>
<div></div>
<input class="button" type="submit" name="submit" value="Save"/>
        </form>
<?php ?>
This script works fine but it will only allow the user to add 1 image per property.
I need to adapt the script so that the following requirements can be met:
- up to 4 images can be added for each property
- each image is renamed 'image1', 'image2' etc. so they can be referenced individually on the 'property details' page on the front-end of the website

Any help would be greatly appreciated!!!

Thanks