CSS question (getting it to work with IE) $10

Project Description:
this is the page in question: http://208.112.52.96/

It contains 3 images. They are supposed to have 6px white padding and 1px CCCCCC border, to imitate the photo look.

It works in Firefox, Chrome, Opera, but not in IE (tested with 6/7)

How can I make it work in IE? this is my CSS:

.photo
{
border-width: 1px;
border-color: #CCCCCC;
padding: 6px;
background-color: #FFFFFF;
}
.photo:hover
{
border-color: #000000;
}