How to make header image larger

[websmith]

I just downloaded and installed the latest Joomla! 2.5.28 / virtuemart package and am trying to enlarge the top header image. I cant seem to find a starting point making this change in beez5.css. Can anyone help with this? Thank you very much.

[jenkinhill]

Starting point is to use Firebug.  http://forum.virtuemart.net/index.php?topic=116620.0

[websmith]

Thank you Jenkinhill. I had firebug installed and found the css section but nothing was changing. Turns out I had the beez5 css open and not the vmbeez5. I got it now. Thanks again.