function startLeftScroll(id){
  var box = document.getElementById(id);
  var box2 = document.createElement('div');
  box2.id = id+'_virtual';
  box2.innerHTML = box.innerHTML;
  box2.className = 'logo_box';
  box.parentNode.appendChild(box2);
  moveABit(id,0);
}
function moveABit(id,position){
    var keepscrolling = true;
    var box = document.getElementById(id);
    var other_box = document.getElementById(id+'_virtual');
    var width = box.offsetWidth;
    position = position - 1;
    box.style.left = position+'px';
    var other_position = position + width;
    other_box.style.left = other_position +'px';
     // if main box is completely hidden, move behind virtual
    var diff = (width) + position;
    if ( diff <= 1 ){
      position = 0;
    }
    if ( keepscrolling )
      setTimeout("moveABit('"+id+"','"+position+"');",10);
}