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_news_0.gif';
	img[3] = '/images/nav_news_1.gif';
	img[4] = '/images/nav_patient_0.gif';
	img[5] = '/images/nav_patient_1.gif';
	img[6] = '/images/nav_pubs_0.gif';
	img[7] = '/images/nav_pubs_1.gif';
	img[8] = '/images/nav_work_0.gif';
	img[9] = '/images/nav_work_1.gif';
	img[10] = '/images/nav_physicians_0.gif';
	img[11] = '/images/nav_physicians_1.gif';
	img[12] = '/images/nav_specialties_0.gif';
	img[13] = '/images/nav_specialties_1.gif';
	img[14] = '/images/nav_staff_0.gif';
	img[15] = '/images/nav_staff_1.gif';
	img[16] = '/images/nav_locations_0.gif';
	img[17] = '/images/nav_locations_1.gif';
	img[18] = '/images/nav_appointment_0.gif';
	img[19] = '/images/nav_appointment_1.gif';
	img[20] = '/images/nav_ask_0.gif';
	img[21] = '/images/nav_ask_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 popup(thename) {
		window.open(thename,"","width=520, height=330,scrollbars=0");
	}