function obj(name)
{
   return document.getElementById(name);
}

function showCredits(name)
{
   images_container = new obj("header_images_container");
   all_divs = images_container.getElementsByTagName("div");
   for (i=0; i<all_divs.length; i++)
   {
      if (all_divs[i].id.search(/_div$/) > 0)
      {
         all_divs[i].style.display = "none";
      }
   }

   all_imgs = images_container.getElementsByTagName("img");
   for (i=0; i<all_imgs.length; i++)
   {
      if (all_imgs[i].id)
      {
         all_imgs[i].style.display = "block";
      }
   }

   img = new obj(name.id + "_img"); 
   div = new obj(name.id + "_div");

   img.style.display = "none";
   div.style.display = "block";
}

function showImage(name)
{
   img = new obj(name.id + "_img"); 
   div = new obj(name.id + "_div");

   img.style.display = "block";
   div.style.display = "none";
}