function newImage(arg) {
	if (document.images)
	{
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}


function changeImages() {
	if (document.images && (preloadFlag == true))
	{
		for (var i=0; i<changeImages.arguments.length; i+=2)
		{
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;

function preloadImages() {
	if (document.images)
	{
		presentation = newImage("../img/presentationon.gif");
		presentation = newImage("../img/oeuvreon.gif");
		presentation = newImage("../img/activiteson.gif");
		presentation = newImage("../img/mediathequeon.gif");
		presentation = newImage("../img/actualiteon.gif");
		presentation = newImage("../img/boutiqueon.gif");
		presentation = newImage("../img/historiqueon.gif");
		presentation = newImage("../img/situationon.gif");
		presentation = newImage("../img/objectifson.gif");
		presentation = newImage("../img/realisationson.gif");
		presentation = newImage("../img/projetson.gif");
		preloadFlag = true;
	}
}