With only one gallery per page:
Code:
.photogallery img {
border: none;!important;
}
will do nicely. Just make sure to only apply that style to the page(s) where you want no border.
Like say you have a stylesheet that all the pages use. It can have:
Code:
.photogallery img {
border: 1px solid #393838;
}
But then in a separate stylesheet used only by the page(s) where you want no border, have:
Code:
.photogallery img {
border: none;!important;
}
Styles cascade, so all pages may have the sheet with the border: 1px solid #393838;. The !important keyword will override it.
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