var description_layers = new Array();
var description_pos, vis_description;

function set_description_pos()
  {
  if(description_layers.length)
    for(var n in description_layers)
      description_layers[n].move(description_pos.x, description_pos.y);
  }

function show_description(cid)
  {
  if(!window.description_pos)
    description_pos = get_image_pos('descrposimage');

  if(cid && !description_layers[cid])
    {
    description_layers[cid] = new layer_object('description'+cid);
    description_layers[cid].move(description_pos.x, description_pos.y);
    }

  if(cid && description_layers[cid])
    description_layers[cid].show(1);

  else if(cid==0 && vis_description && description_layers[vis_description])
    description_layers[vis_description].show(0);

  vis_description = cid;
  }

window.onresize = set_description_pos;