var MainBanner = {

	img: null,
	imgAnimationHeight: 0,
	actualDirection: 'TOPBOTTOM',
	
	init: function () {
		this.img = $('#MainBanner');
		this.imgAnimationHeight = parseInt(this.img.height()) - 150;
		this.animate();
	},

	animate: function () {
		if (MainBanner.actualDirection == 'TOPBOTTOM') {
			var animate = { marginTop: -MainBanner.imgAnimationHeight + 'px' };
		} else {
			var animate = { marginTop: '0px' };
		}
		MainBanner.img.animate(animate, 10000, MainBanner.changeDirection);
	},

	changeDirection: function () {
		if (MainBanner.actualDirection == 'TOPBOTTOM') {
			MainBanner.actualDirection = 'BOTTOMTOP';
		} else {
			MainBanner.actualDirection = 'TOPBOTTOM';
		}
		var i = setTimeout(MainBanner.animate, 1000);
	}

};
$(function () {
	MainBanner.init();
});