function resize() {
	var sombra = document.getElementById('sombra').offsetHeight;
	var bgConteudo = document.getElementById('bg-conteudo').offsetHeight + document.getElementById('rodape').offsetHeight;
	var menu = document.getElementById('menu').offsetHeight;
	var conteudo = document.getElementById('conteudo').offsetHeight;

	if (bgConteudo > sombra) {
		document.getElementById('sombra').style.height = bgConteudo + 'px';
		document.getElementById('corpo').style.height = bgConteudo + 'px';
	}
	
	if (conteudo > menu) {
		document.getElementById('itens-menu').style.height = (conteudo - 50) + 'px';
	}
}

window.onload = resize;
window.onresize = resize;