Problems with home page category pictures.

Hello, Im mike. My associate web develloper and I love nopCommerce, however we seem to be having problems with a clients home page categorie pictures. We have tried and tired again to properly size the pictures on the home page but we are left with white spaces on the sides and top and bottoms of these pictures. I have looked in the css and have changed everyhting I can think of but to no success. Here is a link to the store http://www.silverdaisydesigns.com/store .

If any of you wonderful people can help us with this then that would be excellent. Thanks, Mike.

Edit file:

http://www.silverdaisydesigns.com/silver_daisy_design/store/App_Themes/irresistibleBlack/category.css

And change the background property for the picture class at line #73:

.HomePageCategoryGrid .HomePageCategoryItem .picture
{
background:#FFFFFF none repeat scroll 0 0;
height:125px;
margin:auto;
text-align:center;
vertical-align:middle;
width:125px; 
}

You can delete the property or replace #FFFFFF with transparent

In the same file, you will also want to do the same thing at line #325 to the .CategoryPage .ProductGrid .ProductItem .picture class:

.CategoryPage .ProductGrid .ProductItem .picture
{
background:#FFFFFF none repeat scroll 0 0;
height:125px;
margin:auto;
text-align:center;
vertical-align:middle;
width:125px;
}

.