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                <body><div id="bannerHome"></div></body>


                 .gssLayer {position:absolute; overflow:hidden; width:100%; height:100%; left:0; top:0;}
#bannerHome {


function gssLayout(obj) {
	this.container = obj  //cache some info
	this.w = obj.width()
	this.h = obj.height() = obj.attr('id')
	this.layerCount = 0 = function(tl,delay,trans1,time1,trans2,time2,offset) { //function for creating layers and animating their swapping
		var layer ='-layer-'+ ++this.layerCount,
        oo = $('#'+layer)
			layer = (oo.length >0) ? oo : $('<div id="'+layer+'" class="gssLayer" />').appendTo(this.container) //if old layer exists, use that, otherwise append new layer
		if (this.layerCount !== 1) layer.css('visibility','hidden') //only first visible
		TweenMax.set(layer, {perspective:500})
		if (time1 === 0) time1 = 0.001 //simpler than messing with the rendering mode. Let users pop layers in and out instantly if they wish.
    if (time2 === 0) time2 = 0.001 //I still think should default to immediateRender:false despite the duration used, so this is my silent protest against an illogical convention. 
		if (typeof tl === 'object') { //tl == timeline
			if (typeof trans1 === 'undefined') tl.hide(this.layer,'+='+delay).show(layer) //stop here if no transitions defined, and swap layers
			else {
				var trans = [trans1,trans2],
					style = [{ease:Linear.easeNone},{ease:Linear.easeNone}],
					i = 1 // put arguements and tween objects into arrays
				do { //fill 'style' objects with tween properties based on 'trans' arguements
					var t = trans[i].split(' '), s = style[i]
					for (var c = 0; c < t.length; c++) {
						switch(t[c]) {
              case 'right':
                s.left = this.w
							case 'left':
								s.left = this.w*-1
							case 'spin':
								s.rotation = -720
								s.ease = Power4.easeOut
					style[i] = s
				} while (i--)
				if (offset) offset = '+='+ offset //format offset, if it exists,time1,style[0],'+='+delay).hide(this.layer) //animate out old layer, then hide it
					.show(layer,offset).from(layer,time2,style[1],offset) //make visible, then animate in new layer
    return this.layer = layer
	} first layer

	this.size = function(width,height,callback,tl){ //function to resize the animation and rebuild it
		var t = this, w = width || t.container.width(), h = height || t.container.height()
		if (typeof w === 'string') { //format size ratio arguements if given for width
			var w = width.split('/')
			if (w.length >1) w = Math.floor(w[0] * h / w[1])
		if (typeof h === 'string') { //same for height
			var h = height.split('/')
			if (h.length >1) h = Math.floor(h[1] * w / h[0])
		if (width) t.container.css('width',w) //change dimensions if given, leave alone if passed false/0
		if (height) t.container.css('height',h)
    t.w = w //cache measurements
		t.h = h
		if (callback) {
			if (tl) { }  //empty the timeline
			t.layerCount = 0  //reset layer counter, so new layers aren't created
			$('[id^='+ +'-]').attr('style','') //remove old style attributes, so animations are cleared //make first layer available
			callback() //call timeline creation function
} = function(obj,offset) { //convenience shortcuts
	return this
TimelineMax.prototype.hide = function(obj,offset) {
	return this

var banner = $('#bannerHome'),
  b = new gssLayout(banner), //initialize
  tl = new TimelineMax({repeat:-1})

b.size(0,'7/3',bannerMake,tl) //set ratio size based on current width

setTimeout(function(){ b.size(700,'7/3',bannerMake,tl) }, 5*1000)  //change size based on new width, setting height with ratio, after 5 seconds
function bannerMake() {
		b.layer.css('background-color','yellow') //layer 1,0,'left',1,'spin right',2,-1).css('background','blue') //animate to layer 2,3,{rotation:-720}) //do a spin,3,{left:b.w},'+=2') //slide out
A Pen is worth a thousand docs.