Vanilla 2

open jquery.prettyPhoto.js and find "Inject the inline gallery!"

delete all code or mark it as a comment (/*......*/)

Ex:
// Inject the inline gallery!
/*if(isSet && settings.overlay_gallery) {
currentGalleryPage = 0;
toInject = "";
for (var i=0; i < pp_images.length; i++) {
if(!pp_images[i].match(/\b(jpg|jpeg|png|gif)\b/gi)){
classname = 'default';
img_src = '';
}else{
classname = '';
img_src = pp_images[i];
}
toInject += "";
};

toInject = settings.gallery_markup.replace(/{gallery}/g,toInject);

$pp_pic_holder.find('#pp_full_res').after(toInject);

$pp_gallery = $('.pp_pic_holder .pp_gallery'), $pp_gallery_li = $pp_gallery.find('li'); // Set the gallery selectors

$pp_gallery.find('.pp_arrow_next').click(function(){
$.prettyPhoto.changeGalleryPage('next');
$.prettyPhoto.stopSlideshow();
return false;
});

$pp_gallery.find('.pp_arrow_previous').click(function(){
$.prettyPhoto.changeGalleryPage('previous');
$.prettyPhoto.stopSlideshow();
return false;
});

$pp_pic_holder.find('.pp_content').hover(
function(){
$pp_pic_holder.find('.pp_gallery:not(.disabled)').fadeIn();
},
function(){
$pp_pic_holder.find('.pp_gallery:not(.disabled)').fadeOut();
});

itemWidth = 52+5; // 52 beign the thumb width, 5 being the right margin.
$pp_gallery_li.each(function(i){
$(this)
.find('a')
.click(function(){
$.prettyPhoto.changePage(i);
$.prettyPhoto.stopSlideshow();
return false;
});
});
};*/

Thats all!