$("#arrowheader").on('click', function(){
if ($(".header-middle").height() == 150) {
$(".header-middle").height(20);
$(".header-middle div").height(20);
$("#arrowheader").attr("class","icon-arrow-down")
} else {
$(".header-middle").height(150);
$(".header-middle div").height(150);
$("#arrowheader").attr("class","icon-arrow-up")
}
});