var ie=document.all; var ns=document.getElementById&&!document.all; 
window.onload = menutdi;

function menutdi() {
   document.onmouseover=infuntdi;
   document.onmouseout=oufuntdi;
}

function oufuntdi(e) {
   if (!ie && !ns) { return; }
   if (ns) { oMouse=e.target; } else { oMouse=event.srcElement; }
   if ( oMouse.className == "imgmentdi" ) { oMouse.src = ( oMouse.src.substring( 0, oMouse.src.indexOf('img')+19 ) ) + ".png"; }
}

function infuntdi(e) {
   if (!ie && !ns) { return; }
   if (ns) { oMouse=e.target; } else { oMouse=event.srcElement; }
   if ( oMouse.className == "imgmentdi" ) { oMouse.src = ( oMouse.src.substring( 0, oMouse.src.indexOf('img')+19 ) ) + "b" + ".png"; }
}

function nofuntdi(e) {
   if (!ie && !ns) { return; }
   if (ns) { oMouse=e.target; } else { oMouse=event.srcElement; }
}