window.onload = size;
window.onresize = size;

function size(){
	pngfix();
	var height = document.documentElement.scrollHeight;
	document.getElementById('achtergrond_site').style.height = (height - 166 - 270 + 61 ) + 'px';
	document.getElementById('footer').style.top = (height - 166) + 'px';
}