funtion to move a button from right to left indefinitely

function move(id) {
  var elem = document.getElementById(id);   
  var pos = -10;
  var id = setInterval(frame, 5);
  function frame() {
    if (pos >= window.innerWidth) {
      clearInterval(id);
    } else {
      pos++; 
      elem.style.left = pos + 'px'; 
    }
  }
}