function popup(ev, id, act, w, h, t_img, t_capt) {
  var layer = 'pop_up_' + id
  var img = 'pop_up_' + id + '_image'
  var capt = 'pop_up_' + id + '_caption'
   
  if (act=='show') {
    var o = new getObj(layer)
    var p = new getObj(img)
    var q = new getObj(capt)
	if (o && p && q) {
//	  if (w != 0) {
//	    o.style.width = w
//	  }
//	  if (h != 0) {
//	    o.style.height = h
//	  }
      var copy = '<img src="'  + path_modifier + t_img + '" alt="' + t_capt + '">'
      p.obj.innerHTML = copy
      q.obj.innerHTML = t_capt
      DOMElementSetTopPos(o, DOMWindowGetYScroll()+20);
      wrap_showHideLayers(layer,'','show')
	  mnuOffset(layer, 221)
	}
  }
  else {
    wrap_showHideLayers(layer,'','hide')
  }
}