var IMG_PATH = "images/";

var nav_best_eng_on = new Image();
nav_best_eng_on.src = IMG_PATH + "nav_best_eng_on.gif";
var nav_best_eng_off = new Image();
nav_best_eng_off.src = IMG_PATH + "nav_best_eng_off.gif";

var nav_inspiration_gall_on = new Image();
nav_inspiration_gall_on.src = IMG_PATH + "nav_inspiration_gall_on.gif";
var nav_inspiration_gall_off = new Image();
nav_inspiration_gall_off.src = IMG_PATH + "nav_inspiration_gall_off.gif";

var nav_disc_lenovo_on = new Image();
nav_disc_lenovo_on.src = IMG_PATH + "nav_disc_lenovo_on.gif";
var nav_disc_lenovo_off = new Image();
nav_disc_lenovo_off.src = IMG_PATH + "nav_disc_lenovo_off.gif";

function rollon(what){
	document.images[what].src = eval('nav_' + what + '_on.src');
}
function rolloff(what){
	document.images[what].src = eval('nav_' + what + '_off.src');
}