//preloading images
		
		home_on = new Image();
		home_on.src = "images/n_home_1.gif";
		home_off = new Image();
		home_off.src = "images/n_home_0.gif";
		vaccine_on = new Image();
		vaccine_on.src = "images/n_vaccine_1.gif";
		vaccine_off = new Image();
		vaccine_off.src = "images/n_vaccine_0.gif";
		treatment_on = new Image();
		treatment_on.src = "images/n_treatment_1.gif";
		treatment_off = new Image();
		treatment_off.src = "images/n_treatment_0.gif";
		acute_on = new Image();
		acute_on.src = "images/n_acute_1.gif";
		acute_off = new Image();
		acute_off.src = "images/n_acute_0.gif";

		clickhere_vaccine_on = new Image();
		clickhere_vaccine_on.src = "images/clickhere_vaccine_1.gif";
		clickhere_vaccine_off = new Image();
		clickhere_vaccine_off.src = "images/clickhere_vaccine_0.gif";
		clickhere_treatment_on = new Image();
		clickhere_treatment_on.src = "images/clickhere_treatment_1.gif";
		clickhere_treatment_off = new Image();
		clickhere_treatment_off.src = "images/clickhere_treatment_0.gif";
		clickhere_acute_on = new Image();
		clickhere_acute_on.src = "images/clickhere_acute_1.gif";
		clickhere_acute_off = new Image();
		clickhere_acute_off.src = "images/clickhere_acute_0.gif";

	function rollOn(iName) {
		if (document.images) {
		document[iName].src = eval(iName + "_on.src");
		}
	}

	function rollOff(iName) {
		if (document.images) {
		document[iName].src = eval(iName + "_off.src");
		}
	}


	// resize fix for how NS4.7 draws the javascript document.write for the "click here" buttons
	if (!window.saveInnerWidth) {
		window.onresize = resizeIt;
		window.saveInnerWidth = window.innerWidth;
		window.saveInnerHeight = window.innerHeight;
	}

	function resizeIt() {
		if (saveInnerWidth < window.innerWidth || saveInnerWidth > window.innerWidth || saveInnerHeight > window.innerHeight || saveInnerHeight < window.innerHeight ) {
        	location.reload();
		}
	}


	function openPopup(URL) {
		popupWin = window.open(URL,"slide_show","status=no,resizable=no,scrollbars=no,width=800,height=565");
		if (popupWin.opener == null) popupWin.opener = window; 
		popupWin.opener.name = "hptr_main";
		popupWin.focus ();
	}