var nav_salesoverview_off = new Image();
  nav_salesoverview_off.src = "/images/nav_salesoverview_off.gif";
  var nav_salesoverview_over = new Image();
  nav_salesoverview_over.src = "/images/nav_salesoverview_over.gif";

  var nav_bcommerce_off = new Image();
  nav_bcommerce_off.src = "/images/nav_bcommerce_off.gif";
  var nav_bcommerce_over = new Image();
  nav_bcommerce_over.src = "/images/nav_bcommerce_over.gif";

  var nav_howtobuy_off = new Image();
  nav_howtobuy_off.src = "/images/nav_howtobuy_off.gif";
  var nav_howtobuy_over = new Image();
  nav_howtobuy_over.src = "/images/nav_howtobuy_over.gif";

  var nav_howtosell_off = new Image();
  nav_howtosell_off.src = "/images/nav_howtosell_off.gif";
  var nav_howtosell_over = new Image();
  nav_howtosell_over.src = "/images/nav_howtosell_over.gif";

  var nav_strategicalliances_off = new Image();
  nav_strategicalliances_off.src = "/images/nav_strategicalliances_off.gif";
  var nav_strategicalliances_over = new Image();
  nav_strategicalliances_over.src = "/images/nav_strategicalliances_over.gif";

  var nav_partnershipprogram_off = new Image();
  nav_partnershipprogram_off.src = "/images/nav_partnershipprogram_off.gif";
  var nav_partnershipprogram_over = new Image();
  nav_partnershipprogram_over.src = "/images/nav_partnershipprogram_over.gif";