// note: no leading slash due to offline version creation.
	function imgOver(idStub)
	{
		document.getElementById(idStub).src = 'images/home/'+idStub+'_On.gif';
	}
	function imgOut(idStub)
	{
		document.getElementById(idStub).src = 'images/home/'+idStub+'_Off.gif';
	}
	// -- preload images
	if (document.images)
    {
      var objs = new Array();
      // set image url
      image_url = new Array();
      image_url[image_url.length] = "images/home/HHRA_On.gif";
	image_url[image_url.length] = "images/home/casestudies_On.gif";
	image_url[image_url.length] = "images/home/collaboration_On.gif";
	image_url[image_url.length] = "images/home/economic_On.gif";
	image_url[image_url.length] = "images/home/MonitoringEvaluation_On.gif";
	image_url[image_url.length] = "images/home/prioritization_On.gif";
	image_url[image_url.length] = "images/home/RiskCommunication_On.gif";
	image_url[image_url.length] = "images/home/RM1_On.gif";
	image_url[image_url.length] = "images/home/AboutPOPs_On.gif";
	image_url[image_url.length] = "images/home/sops_On.gif";
	image_url[image_url.length] = "images/home/RM2_On.gif";

       var i = 0;
       for(i=0; i< image_url.length; i++) {
	     var preload_image_object = new Image();
		 preload_image_object.src = image_url[i];
         objs[objs.length] = preload_image_object;
	   }
    }