File Upload

[punstc]

I'm having a file uploading issue. It posts all the information to the database except for the file path and doesnt upload the file. I cant seem to find my problem anywhere in the code my self. Hopefully someone might be able to tell me what I'm doing wrong.

heres my php

<?php

require("../check_login.php");

if(empty($_POST)) {
    $status = 'Add New Post';
    }
    else {
        $post_title = addslashes($_POST['post_title']);
        $post_content = addslashes($_POST['post_content']);
        
        $destination = '../../attachments';
        $attachment = $_FILES['attachment']['name'];
        $attachment_tmp_name = $_FILES['attachment']['tmp_name'];
        
        $error_list = array();
        
        if(empty($post_title)) {
            $error_list[] = 'You did not supply a Title';
            }
            
        if(empty($post_content)) {
            $error_list[] = 'You did not supply any Content';
            }
            
        if(empty($error_list)) {
            
            require("../../../../connect.php");
            
        $sql = "INSERT INTO blog SET post_title='$post_title', post_content='$post_content', date_posted = NOW(); ";
        
        if(!empty($attachment)) {
              if(move_uploaded_file($attachment,"$destination/$attachment")) {
                  $sql .= ", attachment='$attachment' ";
            }
        }
            
        if(mysql_query($sql)) {
            header('Location: index.php');
        }
        else {
                $status ='Unable to add Post';
            }
        }
        else {
            $status = 'Unable to Post';

        $status = '<ul>';
        
        foreach($error_list as $error_message) {
            $status .= "<li>$error_message</li>";
        }
        $status .= '</ul>';
        }
    }

?>

and heres my upload form

<form action="post_add.php" method="post" enctype="multipart/form-data">
            <dl>
            
            <dt><label for="post_title">Title</label></dt>
            <dd><input type="text" name="post_title" id="post_title" value="<?php echo $post_title; ?>" /></dd>
            
            <dt><label for="post_content">Content</label></dt>
            <dd><textarea name="post_content" id="post_content" rows="10" cols="55"><?php echo $post_content; ?></textarea></dd>
        
            <dt><label for="attachment">Attachment</label></dt>
            <dd><input type="file" name="attachment" id="attachment" /></dd>
            
            </dl>
            
            <div>
            	<input type="hidden" name="MAX_FILE_SIZE" value="20000"
                <input type="submit" name="submit" value="Add" />
                <input type="reset" name="reset" value="Reset Form" />
            </div>
        </form>

thanks for the help I appreciate it.