add a hover effect to the news show bg?

Hi there,

I'd like to try and apply a hover effect to the backgrounds of the news show pro modules on my homepage....

I'm trying all sorts of variations of code, to try and drill down to the right part of the module....

I'm trying things like:

Code:
.nsp_nm .gk-box-center .moduletable a:hover {background-color: #000!important; }
.nsp_nm div.gk-npro div.moduletable a:hover {background-color: #000!important; }
.nsp_nm div#gk-box .moduletable .moduletable_menu .moduletable_text:hover {background-color: #000!important;}


As you can see, I don't have a clue what I'm doing, but i'm trying to add in the hover command into the module class suffix that already exists?

Please could someone explain how I can get the right path, with firebug? I just can't work out how you select the correct "drill-down"...and i'm going crazy. The url if you get a chance to take a look is vitaloximeters.co.uk

Thanks for any suggestions,

Olly