function colunas() {
	var me = document.getElementById('main_esquerda');
	var x = me.offsetHeight;

	var mc = document.getElementById('main_centro');
	var y = mc.offsetHeight;
	
	var main = document.getElementById('main');

	if (x>y) { 
		main.style.height = x + "px"; 
	} else { 
		main.style.height = y + "px"; 
	}
	
	var b = main.offsetHeight;
	me.style.height = b + "px"; 
}
function colunainterna() {
	var ct = document.getElementById('conteudo');
	var x = ct.offsetHeight;
	
	var me = document.getElementById('main_esquerda');
	var y = me.offsetHeight;
	
	var main = document.getElementById('main');

	me.style.height = x + "px";
	main.style.height = x + "px"; 
}