if (document.images) {

image1on = new Image();
image1on.src = "images/home_on.gif";

image2on = new Image();
image2on.src = "images/services_on.gif";

image3on = new Image();
image3on.src = "images/rates_on.gif";

image4on = new Image();
image4on.src = "images/fleet_on.gif";

image5on = new Image();
image5on.src = "images/reservation_on.gif";

image6on = new Image();
image6on.src = "images/contact_on.gif";
 
image1off = new Image();
image1off.src = "images/home_off.gif"; 
 
image2off = new Image();
image2off.src = "images/services_off.gif";

image3off = new Image();
image3off.src = "images/rates_off.gif";

image4off = new Image();
image4off.src = "images/fleet_off.gif";

image5off = new Image();
image5off.src = "images/reservation_off.gif";

image6off = new Image();
image6off.src = "images/contact_off.gif";

}

function changeImages() {
if (document.images) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
}

}
}