var glider_current = null;
var glider_timer = null;

function glider_left_enter(glider) {
  if (glider_timer)
    window.clearInterval(glider_timer);
  glider.deltaX = +10;
  glider_current = glider;
  glider_timer = window.setInterval("glider_scroll()", 50);
}

function glider_left_leave(glider) {
  if (glider_timer)
    window.clearInterval(glider_timer);
  glider.deltaX = 0;
  glider_timer = null;
  glider_current = null;
}

function glider_right_enter(glider) {
  if (glider_timer)
    window.clearInterval(glider_timer);
  glider.deltaX = -10;
  glider_current = glider;
  glider_timer = window.setInterval("glider_scroll()", 50);
}

function glider_right_leave(glider) {
  if (glider_timer)
    window.clearInterval(glider_timer);
  glider.deltaX = 0;
  glider_timer = null;
  glider_current = null;
}

function glider_scroll() {
  if (glider_current) {
    var x = glider_current.all.inner.offsetLeft;
    var d = glider_current.deltaX;
    if (!x || x == null || x == "")
      x = 0;
    x = x + d;
    if (x > 0) 
      x = 0;
    if (x < -glider_current.all.inner.offsetWidth + glider_current.offsetWidth )
      x = -glider_current.all.inner.offsetWidth + glider_current.offsetWidth ;
    glider_current.all.inner.style.left = x;
  }
}

function openPopup(url, width, height) {
  window.open(url,'_blank','toolbar=no,location=no,menubar=no,width=' + width + ',height=' + height);
}