function preloadImages() {
 if (document.images) {
  image1 = new Image();
  image1.src = "http://www.idsmachining.com/images/buttonHome_down.gif";

  image2 = new Image();
  image2.src = "http://www.idsmachining.com/images/buttonServices_down.gif";
  
  image3 = new Image();
  image3.src = "http://www.idsmachining.com/images/buttonEDM_down.gif";
  
  image4 = new Image();
  image4.src = "http://www.idsmachining.com/images/buttonCompany_down.gif";

  image5 = new Image();
  image5.src = "http://www.idsmachining.com/images/buttoneContact_down.gif";
  
 } 
}