// preload icon nav bar images
var imgArray = new Array();

imgArray['home_on']      = new Image();
imgArray['home_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_home_on.gif"; 
imgArray['home_off']     = new Image();
imgArray['home_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_home_off.gif";

imgArray['trade_on']      = new Image();
imgArray['trade_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_trade_on.gif"; 
imgArray['trade_off']     = new Image();
imgArray['trade_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_trade_off.gif";

imgArray['links_on']      = new Image();
imgArray['links_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_links_on.gif"; 
imgArray['links_off']     = new Image();
imgArray['links_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_links_off.gif";

imgArray['news_on']      = new Image();
imgArray['news_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_news_on.gif"; 
imgArray['news_off']     = new Image();
imgArray['news_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_news_off.gif";

imgArray['rss_on']      = new Image();
imgArray['rss_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_rss_on.gif"; 
imgArray['rss_off']     = new Image();
imgArray['rss_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_rss_off.gif";

imgArray['blogs_on']      = new Image();
imgArray['blogs_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_blogs_on.gif"; 
imgArray['blogs_off']     = new Image();
imgArray['blogs_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_blogs_off.gif";

imgArray['articles_on']      = new Image();
imgArray['articles_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_articles_on.gif"; 
imgArray['articles_off']     = new Image();
imgArray['articles_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_articles_off.gif";

imgArray['web_on']      = new Image();
imgArray['web_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_web_on.gif"; 
imgArray['web_off']     = new Image();
imgArray['web_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_web_off.gif";

imgArray['account_on']      = new Image();
imgArray['account_on'].src  = "http://www.allworldautomotive.com/images2/nav/icon_account_on.gif"; 
imgArray['account_off']     = new Image();
imgArray['account_off'].src = "http://www.allworldautomotive.com/images2/nav/icon_account_off.gif";

function icon_on(icon) {
  
  img = document.getElementById('b_' + icon);

  img.src = imgArray[icon + '_on'].src;

  }

function icon_off(icon) {
  img = document.getElementById('b_' + icon);

  img.src = imgArray[icon + '_off'].src;
  }