function Etat(num, bt1, bt2)
{
	boutons = new Array(bt1, bt2)
	boutons[num]=boutons[num]+"_on"

	for (i=0; i<2; i++)
	{
		j=i+2
		parent.oben.document.images[j].src="images/" + boutons[i] + ".gif"
	}
}