if (document.images) {
	// the about section default images for index page only
	
	var abo_cred_init = new Image();
	abo_cred_init.src= 'images/abo_credit_broad_off.gif';
	
	var abo_web_init = new Image();
	abo_web_init.src = 'images/abo_credit_web_off.gif';
	
	var abo_thank_init = new Image();
	abo_thank_init.src = 'images/abo_credit_thank_off.gif';

	
	// _new rollover images for credits
	var abo_cred_new = new Image();
	abo_cred_new.src = 'images/abo_credit_broad_on.gif';
	
	var abo_web_new = new Image();
	abo_web_new.src = 'images/abo_credit_web_on.gif';
	
	var abo_thank_new = new Image();
	abo_thank_new.src = 'images/abo_credit_thank_on.gif';
}

function on_nav(basename) { if (document.images) { document.images[basename].src = eval(basename + '_new.src'); }}

function off_nav(basename) { if (document.images) { document.images[basename].src = eval(basename + '_init.src'); }}