if (document.images) {
	var img = new Array();
	//enter images into the array
	img[0] = 'images/nav_about_0.gif';
	img[1] = 'images/nav_about_1.gif';
	img[2] = 'images/nav_research_0.gif';
	img[3] = 'images/nav_research_1.gif';
	img[4] = 'images/nav_experiences_0.gif';
	img[5] = 'images/nav_experiences_1.gif';
	img[6] = 'images/nav_donate_0.gif';
	img[7] = 'images/nav_donate_1.gif';
	img[8] = 'images/nav_resources_0.gif';
	img[9] = 'images/nav_resources_1.gif';
	img[10] = 'images/nav_media_0.gif';
	img[11] = 'images/nav_media_1.gif';
	img[12] = 'images/nav_events_0.gif';
	img[13] = 'images/nav_events_1.gif';
	img[14] = 'images/nav_sponsors_0.gif';
	img[15] = 'images/nav_sponsors_1.gif';
	img[16] = 'images/nav_story_0.gif';
	img[17] = 'images/nav_story_1.gif';
	img[18] = 'images/nav_contact_0.gif';
	img[19] = 'images/nav_contact_1.gif';
	
	var im = new Array();
	
	for (var i = 0; i < img.length; i++) {
		im[i] = new Image();
		im[i].src = img[i];	
	}
}

function toggleImg(imageName, num) {
	if (document.images) {
		document.images[imageName].src = im[num].src;
	}
}

function resolution() {
		document.write("<input name='screenresolution' type='hidden' value='" + screen.width + "x" + screen.height + "' />");
	}
	
function hideAll() {
	document.getElementById('answerOne').style.visibility = 'hidden';
	document.getElementById('answerTwo').style.visibility = 'hidden';
}

function showAnswerOne() {
	document.getElementById('answerOne').style.visibility = 'visible';
	document.getElementById('answerTwo').style.visibility = 'hidden';
}

function showAnswerTwo() {
	document.getElementById('answerOne').style.visibility = 'hidden';
	document.getElementById('answerTwo').style.visibility = 'visible';
}