if (document.images)
{
	// track how many nav buttons there are.
	// this is used in various layer/image control functions
	var navButtons = new Array();
	var subNavMenus = new Array();
	
	// create both the on and off image objects
	cbcaNav_off = new Image();
	cbcaNav_off.src = "images/navWhatIs_off.gif";
	cbcaNav_on = new Image ();
	cbcaNav_on.src = "images/navWhatIs_on.gif";
	// then add them to the image and subNav arrays
	navButtons[navButtons.length] = "cbcaNav";
	subNavMenus[subNavMenus.length] = "cbcaSubNav";

	programsNav_off = new Image();
	programsNav_off.src = "images/navPrograms_off.gif";
	programsNav_on = new Image();
	programsNav_on.src = "images/navPrograms_on.gif";
	navButtons[navButtons.length] = "programsNav";
	subNavMenus[subNavMenus.length] = "programsSubNav";

	publicationsNav_off = new Image();
	publicationsNav_off.src = "images/navPublications_off.gif";
	publicationsNav_on = new Image();
	publicationsNav_on.src = "images/navPublications_on.gif";
	navButtons[navButtons.length] = "publicationsNav";
	subNavMenus[subNavMenus.length] = "publicationsSubNav";

	communityNav_off = new Image();
	communityNav_off.src = "images/navCommunity_off.gif";
	communityNav_on = new Image();
	communityNav_on.src = "images/navCommunity_on.gif";
	navButtons[navButtons.length] = "communityNav";
	subNavMenus[subNavMenus.length] = "communitySubNav";

	membershipNav_off = new Image();
	membershipNav_off.src = "images/navMembership_off.gif";
	membershipNav_on = new Image();
	membershipNav_on.src = "images/navMembership_on.gif";
	navButtons[navButtons.length] = "membershipNav";
	subNavMenus[subNavMenus.length] = "membershipSubNav";

	pressNav_off = new Image();
	pressNav_off.src = "images/navPressPage_off.gif";
	pressNav_on = new Image();
	pressNav_on.src = "images/navPressPage_on.gif";
	navButtons[navButtons.length] = "pressNav";
	subNavMenus[subNavMenus.length] = "pressSubNav";
	
	economicNav_off = new Image();
	economicNav_off.src = "images/navEconomicImpact_off.gif";
	economicNav_on = new Image();
	economicNav_on.src = "images/navEconomicImpact_on.gif";
	navButtons[navButtons.length] = "economicNav";
	subNavMenus[subNavMenus.length] = "economicSubNav";
}