if (document.images) {
	// Preload Sub Navigation
	subnav1a=new Image; subnav1a.src="images/sn_services_counseling1.gif";
	subnav1b=new Image; subnav1b.src="images/sn_services_counseling2.gif";

	subnav2a=new Image; subnav2a.src="images/sn_services_analysis1.gif";
	subnav2b=new Image; subnav2b.src="images/sn_services_analysis2.gif";

	subnav3a=new Image; subnav3a.src="images/sn_services_saliva1.gif";
	subnav3b=new Image; subnav3b.src="images/sn_services_saliva2.gif";
}