// Hide / Show DIV
function toggleDiv(szDivID, iState) // 1 visible, 0 hidden
  {
  var obj = document.layers ? document.layers[szDivID] : document.getElementById ? document.getElementById(szDivID).style : document.all[szDivID].style;
  obj.visibility = document.layers ? (iState ? "show" : "hide") : (iState ? "visible" : "hidden");
  }

// Hide all right-hand content DIVs
function hideAllContentDivs()
  {
  var obj = document.body.getElementsByTagName("DIV");
  for (var i = 0; i < obj.length; i++)
    {
    if (obj[i].className == "rightContent")
	  toggleDiv(obj[i].id, 0)
    }
  }

// Show COntent / Image
function showContent(divId, imageFile)
  {
  if (imageFile.length > 0)
    {
	document.centrePic.src = imageFile;
	}  
  if (divId.length > 0)
    {
    hideAllContentDivs();
    toggleDiv(divId, 1);
	}
  }