You can use CSS3 @media Query: http://www.w3schools.com/cssref/css3_pr_mediaquery.asp
add:
[code]
@media all and (min-width: 1025px) {
#thumbWrapp .thumbnails {
width: 310px;
...
add:
[code]
@media all and (min-width: 1025px) {
#thumbWrapp .thumbnails {
width: 310px;
...