check to see if slidetoggle is open code example

Example: jquery do something if toggle open and close

$('.advance-view').click(function() {
    $('#advance-control').slideToggle('slow', function() {
        if ($('#advance-control').is(':hidden'))
        {
            $('.advance-view').css("background-color", "#2B509A");
        }
        else
        {
            $('.advance-view').css("background-color", "#4D6837");
        }
    });             
});