function scc() {
 if (screen.height <= 768) {
  window.document.body.style.overflow = 'scroll';
 } else {
  window.document.body.style.overflow = 'hidden';
 }
}

function rec() {
 var mc = window.document.getElementById('main');
 if (screen.height <= 768) {
  mc.style.height=700;
 } else {
  mc.style.height='100%';
 }
}

function eletmento() {
 myRef = window.open('urlap.php','mywin','left=20,top=20,width=476,height=650,toolbar=0,location=0,directories=0,status=0,menubar=0,resizable=1,scrollbars=1');
}