function display_dl(id)
{
	var element = document.getElementById(id);
	if(element.style.display == 'block')
	{
		element.style.display = 'none';
	}
	else
	{
		element.style.display = 'block';
	}
}

function display_dl_liste(id)
{
	var cells = document.getElementById(id).getElementsByTagName('ul');
	var element = cells[0];
	if(element.style.display == 'block')
	{
		element.style.display = 'none';
	}
	else
	{
		element.style.display = 'block';
	}
}