function show( id ) 
{
	document.getElementById(id).className  = 'visible';
}
function hide( id ) 
{
	document.getElementById(id).className  = 'hidden';
}
function toggle( id )
{
	var e = document.getElementById(id);
	if(e.style.display == 'block')
   	e.style.display = 'none';
	else
   	e.style.display = 'block';
}