function r_on(i) {
  if (document.images) { 
    if (document[i].src.indexOf("down") < 0) {
      document[i].src = "/agh/images/" + i + "_over.gif"; 
    }
  }
}

function r_off(i) {
  if (document.images) { 
    if (document[i].src.indexOf("down") < 0) {
      document[i].src = "/agh/images/" + i + ".gif"; 
    }
  }
}

function s_on(i) {
  if (document.images) { 
    if (document[i].src.indexOf("down") < 0) {
      document[i].src = "/agh/education/images/" + i + "_over.gif"; 
    }
  }
}

function s_off(i) {
  if (document.images) { 
    if (document[i].src.indexOf("down") < 0) {
      document[i].src = "/agh/education/images/" + i + ".gif"; 
    }
  }
}

function toggle(i,destination) {
  j = "nav_h_" + i;
  k = document.getElementById("div_" + i);
  if (document.images) { 
    if (document[j].src.indexOf("down") < 0) { 
      document[j].src = "/agh/education/images/" + j + "_down.gif"; 
    } else {
      location.href=destination;
    }
  }
  k.style.display = "block";    
}