Esc, arrow-right, arrow-left identifiers.
$(document).keyup(function(e) {
esc key
if (e.keyCode == "27") {
$('.overlay').hide();
left arrow
} else if (e.keyCode == "37") {
$('.arrow_prev').click();
right arrow
} else if (e.keyCode == "39") {
$('.arrow_next').click();
}
});