var image_array = new Array();
image_array[0] = new Image(); image_array[0].src = root_path+"art/img/img_safetycampaignfrau.jpg";
image_array[1] = new Image(); image_array[1].src = root_path+"art/img/img_safetycampaignmann.jpg";

array_zaehler = 0;
function previousimage(image_id) {
  array_zaehler++;
  if (array_zaehler >= image_array.length)	{
    array_zaehler = 0;
  }
  document.images[image_id].src = image_array[array_zaehler].src;
}
function nextimage(image_id) {
  if (array_zaehler <= 0)
    array_zaehler = image_array.length;
  array_zaehler--;
  document.images[image_id].src = image_array[array_zaehler].src;
}