if (document.images) {
  img_on = Array(5);
  img_off = Array(5);
  
  img_on[0] =new Image();  img_on[0].src ="HOME_NRbuttons0.jpg";
  img_off[0] =new Image(); img_off[0].src="HOME_Nbuttons.jpg";

  img_on[1] =new Image();  img_on[1].src ="STUDIOS_NRbuttons0.jpg";
  img_off[1] =new Image(); img_off[1].src="STUDIOS_Nbuttons.jpg";

  img_on[2] =new Image();  img_on[2].src ="PHOTOS_NRbuttons0.jpg";
  img_off[2] =new Image(); img_off[2].src="PHOTOS_Nbuttons.jpg";

  img_on[3] =new Image();  img_on[3].src ="RATES_NRbuttons0_1.jpg";
  img_off[3] =new Image(); img_off[3].src="RATES_Nbuttons.jpg";

  img_on[4] =new Image();  img_on[4].src ="CONTACT_NRbuttons0_1.jpg";
  img_off[4] =new Image(); img_off[4].src="CONTACT_Nbuttons.jpg";  
}

function imgOver(img,idx) {
 if (document.images) img.src=img_on[idx].src;
 return true;
}

function imgOut(img,idx) {
 if (document.images) img.src=img_off[idx].src;
 return true;
}