if(document.images) {

	nsrc_strands = new Image;
	nsrc_strands.src = "/images/nav/n2-nsrc-strands.gif";
	
	nsrc_strands_over = new Image;
	nsrc_strands_over.src = "/images/nav/n2-nsrc-strands-over.gif";

	stc_program = new Image;
	stc_program.src = "/images/nav/n2-stc-program.gif";
	
	stc_program_over = new Image;
	stc_program_over.src = "/images/nav/n2-stc-program-over.gif";

	nsf_supp = new Image;
	nsf_supp.src = "/images/nav/n2-nsf-supp.gif";
	
	nsf_supp_over = new Image;
	nsf_supp_over.src = "/images/nav/n2-nsf-supp-over.gif";	
	
	trans_nsrc_curr = new Image;
	trans_nsrc_curr.src = "/images/nav/n2-trans-nsrc-curr.gif";
	
	trans_nsrc_curr_over = new Image;
	trans_nsrc_curr_over.src = "/images/nav/n2-trans-nsrc-curr-over.gif";

	teacher_res = new Image;
	teacher_res.src = "/images/nav/n2-teacher-res.gif";
	
	teacher_res_over = new Image;
	teacher_res_over.src = "/images/nav/n2-teacher-res-over.gif"; 

	contact = new Image;
	contact.src = "/images/nav/n2-contact.gif";
	
	contact_over = new Image;
	contact_over.src = "/images/nav/n2-contact-over.gif"; 
			
	impact = new Image;
	impact.src = "/images/nav/n2-impact.gif";
	
	impact_over = new Image;
	impact_over.src = "/images/nav/n2-impact-over.gif"; 
	
	faqs = new Image;
	faqs.src = "/images/nav/n2-faqs.gif";
	
	faqs_over = new Image;
	faqs_over.src = "/images/nav/n2-faqs-over.gif"; 
	
	order_info = new Image;
	order_info.src = "/images/nav/n2-order-info.gif";

	order_info_over = new Image;
	order_info_over.src = "/images/nav/n2-order-info-over.gif";
	
	curr_broch = new Image;
	curr_broch.src = "/images/nav/n2-curr-ctr-broch.gif";

	curr_broch_over = new Image;
	curr_broch_over.src = "/images/nav/n2-curr-ctr-broch-over.gif";	
	
	copy_info = new Image;
	copy_info.src = "/images/nav/n2-copy-info.gif";

	copy_info_over = new Image;
	copy_info_over.src = "/images/nav/n2-copy-info-over.gif";
	
	laser_left = new Image;
	laser_left.src = "/images/nav/n2-laser.gif";

	laser_left_over = new Image;
	laser_left_over.src = "/images/nav/n2-laser-over.gif";

// tertiary nav

	units = new Image;
	units.src = "/images/nav/n3-units.gif";

	units_over = new Image;
	units_over.src = "/images/nav/n3-units-over.gif"; 
	
	science_readers = new Image;
	science_readers.src = "/images/nav/n3-science-readers.gif";

	science_readers_over = new Image;
	science_readers_over.src = "/images/nav/n3-science-readers-over.gif";	
	
	modules = new Image;
	modules.src = "/images/nav/n3-modules.gif";

	modules_over = new Image;
	modules_over.src = "/images/nav/n3-modules-over.gif";

	stc_stcms = new Image;
	stc_stcms.src = "/images/nav/n3-stc-stcms.gif";
	
	stc_stcms_over = new Image;
	stc_stcms_over.src = "/images/nav/n3-stc-stcms-over.gif";
	
	bulletin_brd_3 = new Image;
	bulletin_brd_3.src = "/images/nav/n3-bulletin-brd.gif";

	bulletin_brd_3_over = new Image;
	bulletin_brd_3_over.src = "/images/nav/n3-bulletin-brd-over.gif";
	
	stc_teach = new Image;
	stc_teach.src = "/images/nav/n3-stc-teach.gif";

	stc_teach_over = new Image;
	stc_teach_over.src = "/images/nav/n3-stc-teach-over.gif"; 
	
	stc_ms_teach = new Image;
	stc_ms_teach.src = "/images/nav/n3-stc-ms-teach.gif";

	stc_ms_teach_over = new Image;
	stc_ms_teach_over.src = "/images/nav/n3-stc-ms-teach-over.gif"; 

}