function showSubmenu(submenuid, mainmenuid) {
 moptions = document.getElementsByClassName('mmo');
 soptions = document.getElementsByClassName('smo');
 for(i=0; i<moptions.length; i++){ 
   thisoption = moptions[i];
   subrow = soptions[i];
   subrow.style.display = 'none';
   thisoption.className = thisoption.className.replace(/ selected/g,'');
 }
 //document.getElementById(submenuid).style.display = 'block';
 new Effect.Appear(submenuid, {duration: 0.5} ) ;
 mmel = document.getElementById(mainmenuid);
 mmel.className = mmel.className + ' selected';
}