/* navigation on */
var homeon = new Image();homeon.src = "../images/nav/home_over.gif";
var abouon = new Image();abouon.src = "../images/nav/abou_over.gif";
var prodon = new Image();prodon.src = "../images/nav/prod_over.gif";
var clinon = new Image();clinon.src = "../images/nav/clin_over.gif";
var preson = new Image();preson.src = "../images/nav/pres_over.gif";
var mailon = new Image();mailon.src = "../images/nav/mail_over.gif";
var custon = new Image();custon.src = "../images/nav/cust_over.gif";
var conton = new Image();conton.src = "../images/nav/cont_over.gif";
var expron = new Image();expron.src = "../images/nav/expr_over.gif";

/* navigation off */
var homeoff = new Image();homeoff.src = "../images/nav/home.gif";
var abouoff = new Image();abouoff.src = "../images/nav/abou.gif";
var prodoff = new Image();prodoff.src = "../images/nav/prod.gif";
var clinoff = new Image();clinoff.src = "../images/nav/clin.gif"
var presoff = new Image();presoff.src = "../images/nav/pres.gif"
var mailoff = new Image();mailoff.src = "../images/nav/mail.gif";
var custoff = new Image();custoff.src = "../images/nav/cust.gif";
var contoff = new Image();contoff.src = "../images/nav/cont.gif";
var exproff = new Image();exproff.src = "../images/nav/expr.gif";