var gaucheag=200;
var hautag=150;
var gauchera=0;
var hautra=0;

function agrandis() {
	if (gaucheag==0) {
		document.getElementById("contenu-supgauche").style.visibility="hidden";
		document.getElementById("contenu-supgauche-retour").style.visibility="visible";
		gaucheag=200;hautag=150;
	} else {gaucheag=gaucheag-40;
			document.getElementById("contenu-cadre").style.left=gaucheag+"px";
			hautag=hautag-30;
			document.getElementById("contenu-cadre").style.top=hautag+4+"px";
			setTimeout("agrandis()",0);
			}
}

function rapetisse() {
	if (gauchera==200) {
		document.getElementById("contenu-supgauche-retour").style.visibility="hidden";
		document.getElementById("contenu-supgauche").style.visibility="visible";
		gauchera=0;hautra=0;
	} else {gauchera=gauchera+40;
			document.getElementById("contenu-cadre").style.left=gauchera+"px";
			hautra=hautra+30;
			document.getElementById("contenu-cadre").style.top=hautra+"px";
			setTimeout("rapetisse()",0);
			}
}

function rolloversixtine() {
	document.getElementById("sixtine-rollover").style.visibility="visible";
	document.getElementById("sixtine").style.visibility="hidden";
}
function rolloutsixtine() {
	document.getElementById("sixtine-rollover").style.visibility="hidden";
	document.getElementById("sixtine").style.visibility="visible";
}
function rollovercolloque() {
	document.getElementById("colloque-rollover").style.visibility="visible";
	document.getElementById("colloque").style.visibility="hidden";
}
function rolloutcolloque() {
	document.getElementById("colloque-rollover").style.visibility="hidden";
	document.getElementById("colloque").style.visibility="visible";
}