var gasLayerId;
var gnCurrentIndice;
var gnNbItem;
var gnSpeed;
var gnOpacity;
var goTimer;
/*
 * Ajoute un item au rss pour faire un style de diaporama
 * défilant chaque item du rss
 */
function DIAPO_Initialize(pnSpeed)
{
	gasLayerId = new Array();
	gnCurrentIndice = 0;
	gnNbItem = 0;
	gnSpeed = pnSpeed;
	gnOpacity = 0;
}

/*
 * Ajoute un item au rss pour faire un style de diaporama
 * défilant chaque item du rss
 */
function DIAPO_AddLayer(psLayerId)
{
	gasLayerId[gnNbItem] = psLayerId;
	gnNbItem++;
}

function DIAPO_Start()
{
	
	var nOldIndice = gnCurrentIndice;
	if (gnCurrentIndice >= gnNbItem-1)	
	{
		gnCurrentIndice = 0;
	}
	else
	{
		gnCurrentIndice++;
	}
		
	DIAPO_SetTransition(gasLayerId[nOldIndice], gasLayerId[gnCurrentIndice])
	setTimeout('DIAPO_Start()', gnSpeed * 1000);
}


 
function DIAPO_SetTransition(psFromLayer, psToLayer)
{
	document.getElementById(psFromLayer).style.display = 'none';
	document.getElementById(psToLayer).style.display = '';
}