if(document.images){
  pic1= new Image(); 
  pic1.src="/files/body/body_header_home.jpg";
  
  pic2= new Image(); 
  pic2.src="/files/body/body_header_about.jpg";
  
  pic3= new Image(); 
  pic3.src="/files/body/body_header_products.jpg";
  
  pic4= new Image(); 
  pic4.src="/files/body/body_header_disclaimer.jpg";  
  
  pic5= new Image(); 
  pic5.src="/files/body/body_header_contactus.jpg"; 
}

function swapNav(swapTo){
    if(document.getElementById("pulldown_ourproducts").style.visibility != "hidden"){
        document.getElementById("pulldown_ourproducts").style.visibility = "hidden";
    }
    if(document.getElementById("nameOfPopup").style.visibility != "hidden"){
        document.getElementById("nameOfPopup").style.visibility = "hidden";
    }
    
    switch(swapTo){
        case "about":
            document.getElementById("nav_image").src = "/files/body/body_header_about.jpg";
        break;
        case "products":
            document.getElementById("nav_image").src = "/files/body/body_header_products.jpg";
        break;
        case "disclaimer":
            document.getElementById("nav_image").src = "/files/body/body_header_disclaimer.jpg";
        break;
        case "contactus":
            document.getElementById("nav_image").src = "/files/body/body_header_contactus.jpg";
        break;
        case "home":
            document.getElementById("nav_image").src = "/files/body/body_header_home.jpg";
        break;
        default:
            document.getElementById("nav_image").src = "/files/body/body_header_home.jpg";
        break;
    }
}