if (document.images) {

	homeoff = new Image();
	homeoff.src = "images/home.gif";
	andaoff = new Image();
	andaoff.src = "images/anda.gif";
	clinical_studiesoff = new Image();
	clinical_studiesoff.src = "images/clinical_studies.gif";
	historyoff = new Image();
	historyoff.src = "images/history.gif";
	monographsoff = new Image();
	monographsoff.src = "images/monographs.gif";
	resourcesoff = new Image();
	resourcesoff.src = "images/resources.gif";
	
 	homeon = new Image();
	homeon.src = "images/home_2.gif";
	andaon = new Image();
	andaon.src = "images/anda_2.gif";
  	clinical_studieson = new Image();
	clinical_studieson.src = "images/clinical_studies_2.gif";
  	historyon = new Image();
	historyon.src = "images/history_2.gif";
	monographson = new Image();
	monographson.src = "images/monographs_2.gif";
  	resourceson = new Image();
	resourceson.src = "images/resources_2.gif";
}

	// Function to 'activate' images.
        		function imgOn(imgName) {
        			if (document.images) {
            				document[imgName].src = eval(imgName + "on.src");
        			}
			}

	// Function to 'deactivate' images.
        		function imgOff(imgName) {
        			if (document.images) {
            				document[imgName].src = eval(imgName + "off.src");
        			}
			}