Description in tooltip on category page

Hi! I use tooltip plugin from www.nonumber.nl/extensi .
I need to show product description in "mouse over" tooltip.
I know file for edit - /components/com_hikashop/views/product/listing_img.php

What to change in file?

This is THE FILE - this is FULL help for others with some problems!

{tip <div class="hikashop_product_desc" style="text-align:<?php echo $this->align; ?>">
<?php
echo preg_replace('#<hr *id="system-readmore" */>.*#is','',$this->row->product_description);
?>
</div>}
<?php echo $this->image->display(@$this->row->file_path,false,$this->escape($this->row->file_name), '' , '' , $this->image->main_thumbnail_x, $this->image->main_thumbnail_y) ?>
{/tip}