var aryImages = new Array(2);
  var iCnt = 0;
  
  var aNavImg = new Array("ExtranetHomepage","LiteratureRequest","StationeryRequest","OnlineStore","AADSS","LogOff","AdamsRite","Ceco","CorbinRusswin","Curries","FlemingBaron","FolgerAdamEDC","HES","Graham","Markar","McKinney","Norton","Rixson","Sargent","Securitron","Yale");
  
  for (var j=0;j<aNavImg.length;j++)
  	aryImages[iCnt++] = new Array("/extranet/images/nav_" + aNavImg[j] + ".gif","/extranet/images/nav_" + aNavImg[j] + "_swap.gif");

  for (i=0;i<aryImages.length;i++) 
  {
    var preload = new Image();
	for (var j=0;j<2;j++)
    	preload.src = aryImages[i][j];
  }
  function swap(navIndex,imgIndex) 
  {
     document['imgNavSwap' + navIndex].src = aryImages[navIndex][imgIndex];
  }