function afficherpub(){ 
	if (document.getElementById("topbanner247").offsetHeight < 70){
		document.getElementById("topbanner247").style.display="none"; 
		document.getElementById("topbannerAdsense").style.display="block"; 
		document.getElementById("basdepage").style.display="none"; 
	}

	if (document.getElementById("bigbox247").offsetHeight < 245){
		document.getElementById("bigbox247").style.display="none"; 
		document.getElementById("bigboxAdsense").style.display="block"; 
	}

	if (document.getElementById("skyscraper247").offsetHeight < 500){
		document.getElementById("skyscraper247").style.display="none"; 
		document.getElementById("skyscraperAdsense").style.display="block"; 
	}

}