Zend Framework - CRUD with images

[keeper82]

Hi everyone!
I'm trying to manage images uploads using my own class which renames the uploaded file prepending a random string:

define('UPLOAD_PATH', realpath(APPLICATION_PATH . '/../public/uploads'));

class Lib_Form_Element_File extends Zend_Form_Element_File
{
    public function init()
    {
        if($this->isUploaded()) {
            $this->setDestination(UPLOAD_PATH);
            $realname = $this->getFileName(null, false);
            do {
                $filename = UPLOAD_PATH . '/' . md5(time()) . '_' . $realname;
            } while(is_file($filename));
            $this->addFilter('Rename', $filename);
        }
    }
}

With it I can add my own element to a form:

$form->addElement(new Lib_Form_Element_File(array(
        'name' => 'image',
        'label' => 'Image'
        )
    )
);

When inserting everything is OK. I have problems while updating/deleting the record.
I'm trying to find a way to:

• Display the current image inside the modify form
• Find a way to remove the current image without uploading another one
• Delete the image while deleting the associated row (this is probably simple)

Suggestions anyone?
How do you manage these problems?
I'm also trying to associate a photo gallery for every row so any help is very much appreciated! :)