function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function preloadImages() {
	if (document.images) {
		homepage_registry_on = newImage("img/homepage_registry_on.gif");
		homepage_registry_off = newImage("img/homepage_registry_off.gif");
		homepage_proposal_on = newImage("img/homepage_proposal_on.gif");
		homepage_proposal_off = newImage("img/homepage_proposal_off.gif");
		pahintrodemocallout_on = newImage("img/pahintrodemocallout_on.gif");
		pahintrodemocallout_off = newImage("img/pahintrodemocallout_off.gif");
		timelinecallout_on = newImage("img/timelinecallout_on.gif");
		timelinecallout_off = newImage("img/timelinecallout_off.gif");
		preloadFlag = true;
	}
}

var preloadFlag = false;