$(document).ready(function() {
$("#photosA li img").hover(function(){
var change = $(this).attr("src");
document.images['photo'].src= change;
$(this).css({ background:"#fff" });
},function(){
$(this).css({ background:"transparent" });
});
$("#photosB li img").hover(function(){
var change = $(this).attr("src");
document.images['photo'].src= change;
$(this).css({ background:"#fff" });
},function(){
$(this).css({ background:"transparent" });
});
});