$(document).ready(function(){
	$(window).resize(resizeImages);
	$(window).scroll(windowScroll);
	resizeImages();
});

var heading_image_ratio = 2000 / 1387;

function resizeImages() {
	var window_width = $(window).width();
	$("img#heading_image").width(window_width);
	$("img#heading_image").height(window_width / heading_image_ratio);
}

function windowScroll() {
	var scroll = $(window).scrollTop() / 2;
	$("img#heading_image").css("top", scroll+"px");
}