//Barra de rolagem para elementos com display = block
function rolagem () {
	var i;
	document.getElementById('descer').onmousedown = function() {
		i = window.setInterval("document.getElementById('recado').scrollTop += 15", 100);
	}
	document.getElementById('subir').onmousedown = function() {
		i = window.setInterval("document.getElementById('recado').scrollTop -= 15", 100);
	}
	document.getElementById('descer').onmouseup = function() {
		clearInterval(i);
	}
	document.getElementById('subir').onmouseup = function() {
		clearInterval(i);
	}
}