function afficheDescURL(nomlayer, toThis)
{
	if (document.getElementById)
	{
		if (document.getElementById(nomlayer).innerHTML == "")
		{
			document.getElementById(nomlayer).innerHTML = toThis;
			layeron = nomlayer;
		}
		else
		{
			document.getElementById(nomlayer).innerHTML = "";
			layeron = "";
		}
	}
	else if (document.all)
	{
		if (document.all[nomlayer].innerHTML == "")
		{
			document.all[nomlayer].innerHTML = toThis;
			layeron = nomlayer;
		}
		else
		{
			document.all[nomlayer].innerHTML = "";
			layeron = "";
		}
	}
}