function resizeIframe() {
	var h = (window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight);
	//var h = iframeContent.document.body.scrollHeight;
	h -= document.getElementById('iframeContent').offsetTop;
    
    // not sure how to get this dynamically
    h -= 20; /* whatever you set your body bottom margin/padding to be */
  
  	//alert(h);  
    document.getElementById('iframeContent').style.height = h +"px";
    
};
window.onresize = resizeIframe;