function showLevel(itemID,itemImgRoot,itemImgPrefix,_itemShow,_itemHide)
{
  var thisLevelShow = document.getElementById(_itemShow+"_"+itemID);
  var thisLevelShowImg = document.getElementById("img_"+_itemShow+"_"+itemID);
  var thisLevelHide = document.getElementById(_itemHide+"_"+itemID);
  var thisLevelHideImg = document.getElementById("img_"+_itemHide+"_"+itemID);
  
  thisLevelShow.style.display = "block";
  thisLevelShowImg.src = itemImgRoot+"styles/images/"+itemImgPrefix+"_view_"+_itemShow+"_selected.jpg";
  thisLevelHide.style.display = "none";
  thisLevelHideImg.src = itemImgRoot+"styles/images/"+itemImgPrefix+"_view_"+_itemHide+"_unselected.jpg";
}