// JavaScript Document
function desce(){
var el = document.getElementById("projetos-1");
el.scrollTop += 10;
}

function descer(){
tempo = window.setInterval(function(){ desce(); }, 100);
}

function sobe(){
var el = document.getElementById("projetos-1");
el.scrollTop -= 10;
}

function subir(){
tempo = window.setInterval(function(){ sobe(); }, 100);
}

function parar(){
window.clearInterval(tempo);
}