var restoreimgsrc="";

function MMon(p){
restoreimgsrc = document.images[p].src;
document.images[p].src=restoreimgsrc.substring(0,restoreimgsrc.length-4)+"_on.jpg";
}
function MMof(p){
 document.images[p].src=restoreimgsrc;
}

function ShowMe(el) {
restoreimgsrc = el;
  document.all[el].style.visibility = "visible";
}
function HideMe(el) {
  document.all[el].style.visibility = "hidden";
}