// PreLoad images...

if (document.images)
 {
  img1=new Image();
  img1.src="images/boton-home.jpg";
  img2=new Image();
  img2.src="images/boton-home-rollover.jpg";
  img3=new Image();
  img3.src="images/boton-about-us.jpg";
  img4=new Image();
  img4.src="images/boton-about-us-rollover.jpg";
  img5=new Image();
  img5.src="images/boton-products.jpg";
  img6=new Image();
  img6.src="images/boton-products-rollover.jpg";
  img7=new Image();
  img7.src="images/boton-recipes.jpg";
  img8=new Image();
  img8.src="images/boton-recipes-rollover.jpg";
  img9=new Image();
  img9.src="images/boton-order-status.jpg";
  img10=new Image();
  img10.src="images/boton-order-status-rollover.jpg";
  img11=new Image();
  img11.src="images/boton-contact-us.jpg";
  img12=new Image();
  img12.src="images/boton-contact-us-rollover.jpg";  
 }

// Change buttons function...

function ChangeImage(imagen1,imagen2)
{
  if (document.images) imagen1.src=imagen2.src;
}