function preload(imgObj,imgSrc) 
{
   eval(imgObj+' = new Image()')
   eval(imgObj+'.src = "'+imgSrc+'"')
}

preload('english_on','/images/english_on.gif');
preload('english_off','/images/english_off.gif');
preload('francais_on','/images/francais_on.gif');
preload('francais_off','/images/francais_off.gif');
preload('mainbuttons_youth_bottom_on','/images/mainbuttons_youth_bottom_on.jpg');
preload('mainbuttons_youth_bottom_off','/images/mainbuttons_youth_bottom_off.jpg');
preload('mainbuttons_youth_top_on','/images/mainbuttons_youth_top_on.jpg');
preload('mainbuttons_youth_top_off','/images/mainbuttons_youth_top_off.jpg');
preload('mainbuttons_parents_bottom_on','/images/mainbuttons_parents_bottom_on.jpg');
preload('mainbuttons_parents_bottom_off','/images/mainbuttons_parents_bottom_off.jpg');
preload('mainbuttons_parents_top_on','/images/mainbuttons_parents_top_on.jpg');
preload('mainbuttons_parents_top_off','/images/mainbuttons_parents_top_off.jpg');
preload('mainbuttons_educators_bottom_on','/images/mainbuttons_educators_bottom_on.jpg');
preload('mainbuttons_educators_bottom_off','/images/mainbuttons_educators_bottom_off.jpg');
preload('mainbuttons_educators_top_on','/images/mainbuttons_educators_top_on.jpg');
preload('mainbuttons_educators_top_off','/images/mainbuttons_educators_top_off.jpg');
preload('mainbuttons_corp_bottom_on','/images/mainbuttons_corp_bottom_on.jpg');
preload('mainbuttons_corp_bottom_off','/images/mainbuttons_corp_bottom_off.jpg');
preload('mainbuttons_corp_top_on','/images/mainbuttons_corp_top_on.jpg');
preload('mainbuttons_corp_top_off','/images/mainbuttons_corp_top_off.jpg');
preload('mainbuttons_media_bottom_on','/images/mainbuttons_media_bottom_on.jpg');
preload('mainbuttons_media_bottom_off','/images/mainbuttons_media_bottom_off.jpg');
preload('mainbuttons_media_top_on','/images/mainbuttons_media_top_on.jpg');
preload('mainbuttons_media_top_off','/images/mainbuttons_media_top_off.jpg');
preload('mainbuttons_general_bottom_on','/images/mainbuttons_general_bottom_on.jpg');
preload('mainbuttons_general_bottom_off','/images/mainbuttons_general_bottom_off.jpg');
preload('mainbuttons_general_top_on','/images/mainbuttons_general_top_on.jpg');
preload('mainbuttons_general_top_off','/images/mainbuttons_general_top_off.jpg');
preload('topnav_menu_about_on','/images/topnav_menu_about_on.gif');
preload('topnav_menu_about_off','/images/topnav_menu_about_off.gif');
preload('topnav_menu_contact_on','/images/topnav_menu_contact_on.gif');
preload('topnav_menu_contact_off','/images/topnav_menu_contact_off.gif');
preload('topnav_menu_sponsors_on','/images/topnav_menu_sponsors_on.gif');
preload('topnav_menu_sponsors_off','/images/topnav_menu_sponsors_off.gif');
preload('topnav_menu_language_on','/images/topnav_menu_language_on.gif');
preload('topnav_menu_language_off','/images/topnav_menu_language_off.gif');
preload('topnav_menu_login_on','/images/topnav_menu_login_on.gif');
preload('topnav_menu_login_off','/images/topnav_menu_login_off.gif');


function img_toggle( imgName, mode ) 
{
   if( document.images ) 
   {
      document[ imgName ].src = eval( imgName + "_" + mode + ".src" );
   }
}