Looking for documentation? Take a look on our wiki
Firstly http://forum.virtuemart.net/index.php?topic=79799.0Then see http://forum.virtuemart.net/index.php?topic=116620.0
For security reasons you should update to Joomla 2.5.17 at least, and VM 2.0.14You tried css?? Just override the value the height value for .product_name