if (document.images) {
	// Preload Sub Navigation
	subnav1a=new Image; subnav1a.src="images/sn_elec_comp1.gif";
	subnav1b=new Image; subnav1b.src="images/sn_elec_comp2.gif";

	subnav2a=new Image; subnav2a.src="images/sn_emb_comp1.gif";
	subnav2b=new Image; subnav2b.src="images/sn_emb_comp2.gif";

	subnav3a=new Image; subnav3a.src="images/sn_eng_design1.gif";
	subnav3b=new Image; subnav3b.src="images/sn_eng_design2.gif";

	subnav4a=new Image; subnav4a.src="images/sn_exc_inv1.gif";
	subnav4b=new Image; subnav4b.src="images/sn_exc_inv2.gif";
}