function preloadnav() 
{
nav1Image = new Image(); 
nav1Image.src = " /images/nav_schedule_on.gif";
nav2Image = new Image(); 
nav2Image.src = "/images/nav_pilates_on.gif";
nav3Image = new Image(); 
nav3Image.src = "/images/nav_alternatives_on.gif";
nav4Image = new Image(); 
nav4Image.src = "/images/nav_about_on.gif";
nav5Image = new Image(); 
nav5Image.src = "/images/nav_results_on.gif";
nav6Image = new Image(); 
//nav6Image.src = "/images/nav_fitnesschallenge_on.gif";
nav6Image.src = "/images/nav_contact_on.gif";
}