function resize() {
	var menu = document.getElementById('menu').offsetHeight;
	var conteudo = document.getElementById('conteudo').offsetHeight;

	if (menu > conteudo) {
		document.getElementById('conteudo').style.height = (menu - 5) + 'px';
	}

	else {
		document.getElementById('op-menu').style.height = (conteudo - 36) + 'px';
	}
}

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