if (document.images)
{
var off1 = new Image();
off1.src = "images/nav-about.jpg";
var on1 = new Image();
on1.src = "images/nav-about-on.jpg";

var off2 = new Image();
off2.src = "images/nav-products.jpg";
var on2 = new Image();
on2.src = "images/nav-products-on.jpg";

var off3 = new Image();
off3.src = "images/nav-advantages.jpg";
var on3 = new Image();
on3.src = "images/nav-advantages-on.jpg";

var off4 = new Image();
off4.src = "images/nav-information.jpg";
var on4 = new Image();
on4.src = "images/nav-information-on.jpg";

var off5 = new Image();
off5.src = "images/nav-testimonials.jpg";
var on5 = new Image();
on5.src = "images/nav-testimonials-on.jpg";

var off6 = new Image();
off6.src = "images/nav-contact.jpg";
var on6 = new Image();
on6.src = "images/nav-contact-on.jpg";

}

function one()
{
if (document.images)
document.images.button1.src = on1.src;
window.status = '' ;
}

function two()
{
if (document.images)
document.images.button1.src = off1.src;
window.status = '' ;
}


function three()
{
if (document.images)
document.images.button2.src = on2.src;
window.status = '' ;
}

function four()
{
if (document.images)
document.images.button2.src = off2.src;
window.status = '' ;
}

function five()
{
if (document.images)
document.images.button3.src = on3.src;
window.status = '' ;
}

function six()
{
if (document.images)
document.images.button3.src = off3.src;
window.status = '' ;
}

function seven()
{
if (document.images)
document.images.button4.src = on4.src;
window.status = '' ;
}

function eight()
{
if (document.images)
document.images.button4.src = off4.src;
window.status = '' ;
}

function nine()
{
if (document.images)
document.images.button5.src = on5.src;
window.status = '' ;
}

function ten()
{
if (document.images)
document.images.button5.src = off5.src;
window.status = '' ;
}

function eleven()
{
if (document.images)
document.images.button6.src = on6.src;
window.status = '' ;
}

function twelve()
{
if (document.images)
document.images.button6.src = off6.src;
window.status = '' ;
}