var about_up, about_dn;
var contact_up, contact_dn;
var help_up, help_dn;
var home_up, home_dn;
var mysa_up, mysa_dn;
var news_up, news_dn;
var opk_up, opk_dn;
var pr_up, pr_dn;

var images_loaded = 0;
var browser = navigator.userAgent.substring(0,9);

images_loaded = 0;

if (browser == "Mozilla/3" || browser == "Mozilla/4") {

  about_up = new Image();
  about_up.src = "/b2c/images/nav/about_hit_dn.gif";
  about_dn = new Image();
  about_dn.src = "/b2c/images/nav/about_hit_dn.gif";
  
  contact_up = new Image();
  contact_up.src = "/b2c/images/nav/contact_up.gif";
  contact_dn = new Image();
  contact_dn.src = "/b2c/images/nav/contact_hit_dn.gif";
  
  help_up = new Image();
  help_up.src = "/b2c/images/nav/help_up.gif";
  help_dn = new Image();
  help_dn.src = "/b2c/images/nav/help_hit_dn.gif";

  home_up = new Image();
  home_up.src = "/b2c/images/nav/home_orng_up.gif";
  home_dn = new Image();
  home_dn.src = "/b2c/images/nav/home_orng_hit_dn.gif";
  
  mysa_up = new Image();
  mysa_up.src = "/b2c/images/nav/mysa_up.gif";
  mysa_dn = new Image();
  mysa_dn.src = "/b2c/images/nav/mysa_hit_dn.gif";

  images_loaded = 1;
}

function btnup(btn_name) {
	if ( !images_loaded ) return;
        if (document.images) {
            document[btn_name].src = eval(btn_name + "_up.src");
        }
}

function btndn(btn_name) {
	if ( images_loaded ) {
          if (document.images) {
              document[btn_name].src = eval(btn_name + "_dn.src");
          }
        }
	return true;
}