JS: Resize iFrame to its content

gistfile1.js

$("#modalIFrame").bind('load',
	function () {
		var newheight, 
		newwidth;

		newheight = this.contentWindow.document.body.scrollHeight;
		newwidth = this.contentWindow.document.body.scrollWidth;

		$(this).height(newheight);
		$(this).width(newwidth);
	}
	);

$("#modalIFrame").attr('src', url);