 >= 0) dy = "+" + dy;

    wwr_req("SET/TRACK/" + g_inspect_tridx + "/VOL/" + dy + ";TRACK/" + g_inspect_tridx)
    return false;
  };

  if (istouch) {
    var end = function(e) { document.removeEventListener('touchmove',movee,true); document.removeEventListener('touchend',end,true); return false; };
    document.addEventListener('touchmove',movee,true);
    document.addEventListener('touchend', end,true);
  } else {
    document.onmousemove = movee;
    document.onmouseup = function(e) { document.onmousem