// ** create MouseOver functions
function MouseOn (ImgName) {
  if (document.images) {
    a = eval(ImgName + "On.src"); // convert strings to object (JavaScript code)
    document.images[ImgName].src = a; // turn on
  }
}


// ** create MouseOut functions
function MouseOff (ImgName) {
  if (document.images) {
    document.images[ImgName].src = eval(ImgName + "Off.src"); // turn off
  }
}