$(window).scroll(function() {
    var top = $(document).scrollTop();
    if (top < 540) $("#menubar").css({top: '0', height: '65px', position: 'relative'}),
	$("#homebtn,#aboutbtn,#carsbtn,#condbtn,#whybtn,#faqbtn,#artbtn,#contactbtn,#toursbtn,#usefulbtn").css({paddingTop: '21px', height: '44px',})
	;
else $("#menubar").css({top: '0', height: '40px', position: 'fixed'}),
$("#homebtn,#aboutbtn,#carsbtn,#condbtn,#whybtn,#faqbtn,#artbtn,#contactbtn,#toursbtn,#usefulbtn").css({paddingTop: '9px', height: '31px',});
});