if (document.images)
{
//first images for rollover	
var home_init= new Image ();
home_init.src="assets/home_up.gif";
var service_init = new Image();
service_init.src="assets/service_up.gif";
var contact_init = new Image();
contact_init.src="assets/contact_up.gif";
var links_init = new Image();
links_init.src="assets/links_up.gif";
var gallery_init = new Image();
gallery_init.src="assets/gallery_up.gif";
var history_init = new Image();
history_init.src="assets/history_up.gif";
var staff_init = new Image();
staff_init.src="assets/staff_up.gif";
var commercial_init = new Image();
commercial_init.src="assets/commercial_up.gif";
var dairy_init = new Image();
dairy_init.src="assets/dairy_up.gif";

//second images for rollover.
var home_new=new Image();
home_new.src="assets/home_down.gif";
var service_new=new Image();
service_new.src="assets/service_down.gif";
var contact_new=new Image();
contact_new.src="assets/contact_down.gif";
var links_new=new Image();
links_new.src="assets/links_down.gif";
var gallery_new=new Image();
gallery_new.src="assets/gallery_down.gif";
var history_new=new Image();
history_new.src="assets/history_down.gif";
var staff_new=new Image();
staff_new.src="assets/staff_down.gif";
var commercial_new=new Image();
commercial_new.src="assets/commercial_down.gif";
var dairy_new=new Image();
dairy_new.src="assets/dairy_down.gif";
  
}
function change_it(the_image)//original image is changed
{
  if (document.images)
  {
    document.images[the_image].src= eval(the_image + "_new.src");
  }
}
function change_back(the_image)//changes image back to original
{
  if (document.images)
  {
    document.images[the_image].src=eval(the_image + "_init.src");
  }
}