function rollOver(src) 
{
  document.getElementById(src).src = "/images/" + src + "_RO.png";
}
function rollOut(src) {
  document.getElementById(src).src = "/images/" + src + ".png";
}

function rollOverByElement(inele, img) 
{
  inele.src = img;
}
function rollOutByElement(inele, img) {
  inele.src = img;
}

function rollOverByLevel(src, lvl) 
{
  document.getElementById(src).src = lvl + "images/" + src + "_RO.png";
}
function rollOutByLevel(src, lvl) {
  document.getElementById(src).src = lvl + "images/" + src + ".png";
}