window.addEvent("domready",function()
{
	var NomNav = navigator.appName;
	var VersNav = navigator.appVersion;	
	VersNav = VersNav.charAt(VersNav.indexOf("MSIE")+5);	
	VersNav = parseInt(VersNav.charAt(0));
	 if (NomNav == "Microsoft Internet Explorer" && VersNav < 7) {
		$('conteneur_gauche').setStyle('display','none');
		$('conteneur_gauche_notavaible').setStyle('display','block');
	} 
});