function setPng24(obj) { 
  obj.width=obj.height=1; 
  obj.className=obj.className.replace(/\bpng24\b/i,''); 
  obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+ obj.src +"',sizingMethod='image');" 
  obj.src='';  
  return ''; 
}

function menu_on(num){
	document.getElementById('m'+num).style.visibility = 'visible';
	document.getElementById('n'+num).style.visibility = 'hidden';
}
function menu_off(num){
	document.getElementById('m'+num).style.visibility='hidden'
	document.getElementById('n'+num).style.visibility = 'visible';
}