//Detect Browser Type & Version

		var browser_type=navigator.appName

		var browser_version=parseInt(navigator.appVersion)

		

		//if NS 4+

		if (browser_type=="Netscape"&&browser_version>=4)

		document.write('<link rel=stylesheet type=text/css href=derm_NN.css>')

		//if IE 4+

		else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4)

		document.write('<link rel=stylesheet type=text/css href=derm.css>')

		//Default goto page (NOT NS 4+ and NOT IE 4+)

		else

		document.write('<link rel=stylesheet type=text/css href=derm.css>')

		//End Detect Browser Type & Version

		// onMouseOver change image for buttons in nav bars

		function changeButtonImage(buttonName,sourceImage) {

			document [buttonName].src = sourceImage.src;

		}

		

		// pre-load an image for the nav bars so that it's ready when we want to use it.

		function preLoadImage(imageURL) {

				image = new Image();

				image.src = imageURL;

				return image;

		}

		
		
		// Set up all the alternative nav bar buttons

		btnED_on = preLoadImage("images/tnav_education_on.gif");
		btnED_off = preLoadImage("images/tnav_education_off.gif");
		btnED_over = preLoadImage("images/tnav_education_over.gif");
		
		btnRE_on = preLoadImage("images/tnav_research_on.gif");
		btnRE_off = preLoadImage("images/tnav_research_off.gif");
		btnRE_over = preLoadImage("images/tnav_research_over.gif");
		
		btnSV_on = preLoadImage("images/tnav_service_on.gif");
		btnSV_off = preLoadImage("images/tnav_service_off.gif");
		btnSV_over = preLoadImage("images/tnav_service_over.gif");
		
		btnHO_on = preLoadImage("images/tnav_home_on.gif");
		btnHO_off = preLoadImage("images/tnav_home_off.gif");
		btnHO_over = preLoadImage("images/tnav_home_on.gif");

		btnAB_on = preLoadImage("images/tnav_about_us_on.gif");
		btnAB_off = preLoadImage("images/tnav_about_us_off.gif");
		btnAB_over = preLoadImage("images/tnav_about_us_on.gif");
		
		btnPR_on = preLoadImage("images/tnav_press_on.gif");
		btnPR_off = preLoadImage("images/tnav_press_off.gif");
		btnPR_over = preLoadImage("images/tnav_press_on.gif");
		
		btnCU_on = preLoadImage("images/tnav_contact_us_on.gif");
		btnCU_off = preLoadImage("images/tnav_contact_us_off.gif");
		btnCU_over = preLoadImage("images/tnav_contact_us_on.gif");
		
		btnSM_on = preLoadImage("images/tnav_site_map_on.gif");
		btnSM_off = preLoadImage("images/tnav_site_map_off.gif");
		btnSM_over = preLoadImage("images/tnav_site_map_on.gif");
		
		btnPA_on = preLoadImage("images/tnav_patients_on.gif");
		btnPA_off = preLoadImage("images/tnav_patients_off.gif");
		btnPA_over = preLoadImage("images/tnav_patients_over.gif");
		
		btnDO_on = preLoadImage("images/tnav_doctors_on.gif");
		btnDO_off = preLoadImage("images/tnav_doctors_off.gif");
		btnDO_over = preLoadImage("images/tnav_doctors_over.gif");
		
		btnCO_on = preLoadImage("images/tnav_companies_on.gif");
		btnCO_off = preLoadImage("images/tnav_companies_off.gif");
		btnCO_over = preLoadImage("images/tnav_companies_over.gif");