if (document.images) {
  option1_off = new Image(56,20);
  option1_off.src = "images/nav/nav_home.gif";
  option1_on = new Image(56,20);
  option1_on.src = "images/nav/nav_home_over.gif";

  option2_off = new Image(147,20);
  option2_off.src = "images/nav/nav_products.gif";
  option2_on = new Image(147,20);
  option2_on.src = "images/nav/nav_products_over.gif";

  option3_off = new Image(185,20);
  option3_off.src = "images/nav/nav_member.gif";
  option3_on = new Image(185,20);
  option3_on.src = "images/nav/nav_member_over.gif";

  option4_off = new Image(95,20);
  option4_off.src = "images/nav/nav_testimonials.gif";
  option4_on = new Image(95,20);
  option4_on.src = "images/nav/nav_testimonials_over.gif";

  option5_off = new Image(118,20);
  option5_off.src = "images/nav/nav_contact.gif";
  option5_on = new Image(118,20);
  option5_on.src = "images/nav/nav_contact_over.gif";

}

function rollover(imgDocID,imgObjName) {
    if (document.images) {
    document.images[imgDocID].src = eval(imgObjName + ".src");
  }
}