Quote:
If you're trying to set the next to last elements background-color try;
$(".Pagin_1").last().prev().css("background-color", "green");
If you are trying to set the last element try;
$(".Pagin_1").last().css("background-color", "green");
If you are trying to set both .Pagin_1 and #next you need to do it separately.
$(".Pagin_1").css("background-color", "green");
$("#next").css("background-color", "green");
If neither of these I can't see what you're trying to do!