function Menu_On(imgname,numg,numd)
{
	CacheTout();
	var str1 = "document."+imgname+".src='img/ext/menu/"+imgname+"_on.gif';";
	str2 = "document.arbre"+numg+".src='img/ext/menu/arbre_gauche.gif';";
	str3 = "document.arbre"+numd+".src='img/ext/menu/arbre_droite.gif';";
	eval(str1+str2+str3);
}

function Menu_Off(imgname,numg,numd)
{
	var str1 = "document."+imgname+".src='img/ext/menu/"+imgname+"_off.gif';";
	str2 = "document.arbre"+numg+".src='img/ext/menu/arbre_transp.gif';";
	str3 = "document.arbre"+numd+".src='img/ext/menu/arbre_transp.gif';";
	eval(str1+str2+str3);
}

function CacheTout()
{
	Menu_Off("decouvrez",1,2);
	Menu_Off("nosprog",2,3);
	Menu_Off("nosrea",3,4);
	Menu_Off("lesagences",4,5);
	Menu_Off("contacts",5,6);
}