if (document.images) {
  var himages = new Array(11);
  himages[0] = "images/nav_home_over.gif";
  himages[1] = "images/nav_contact_over.gif";
  himages[2] = "images/nav_sitemap_over.gif";
  himages[3] = "images/nav_help_over.gif";
  himages[5] = "images/nav_about_over.gif";
  himages[6] = "images/nav_research_over.gif";
  himages[7] = "images/nav_education_over.gif";
  himages[8] = "images/nav_facilities_over.gif";
  himages[9] = "images/nav_faculty_over.gif";
  var simages = new Array(5);
  simages[0] = "images/side_location_over.gif"
  simages[1] = "images/side_physician_over.gif"
  simages[2] = "images/side_services_over.gif"
  simages[3] = "images/side_treatments_over.gif"
}
function h_on(i) {
 if (document.images) {
   document[i].src = "images/" + i + "_over.gif";
 }
}
function h_off(i) {
  if (document.images) {
   document[i].src = "images/" + i + ".gif";
  }
}
function s_on(i) {
 if (document.images) {
   document[i].src = "images/" + i + "_over.gif";
 }
}
function s_off(i) {
  if (document.images) {
   document[i].src = "images/" + i + ".gif";
  }
}