Good!
Not fine programmation but works!
The variable $titolo , is directly in my language but it's easy to put here the general language text. I haven't time at moment

I put my personal quantity. What is the variabile for Stock Notification? Putting it in the quantity make it work for every product.
If you know give me the right var
Here the code
<div class="paddingtop8b">
<?php if ($this->product->product_in_stock == 0) {
$livello='nostock';
$titolo='Spiacente, attualmente non ne abbiamo disponibili';
} elseif ($this->product->product_in_stock < 2) {
$livello='lowstock';
$titolo='Sono rimasti gli ultimi';
}
else {
$livello='normalstock';
$titolo='Ne abbiamo in abbondanza';
}
?>
<span><?php echo JText::_('COM_VIRTUEMART_STOCK_LEVEL_DISPLAY_TITLE_TIP') ?></span><span class="vmicon vm2-<?php echo $livello?>" title="<?php echo $titolo ?>"></span>
</div>