function changeRO(nb)
		{
			switch(nb)
			{
				case 1 :
				str = 'In areas with high concentrations at peak hours';
				break;
				case 2 :
				str = 'During the purchase, to meet the consumer';
				break;
				case 3 :
				str = 'At the closest of your target and its behaviors';
				break;
				case 4 :
				str = 'At strategic locations for a higher visibility';
				break;
                
				
			}
			// remplacement du texte de la balise rolloverDiv
			document.getElementById('rolloverDiv').innerHTML = str;
			
		}
		function clearRO()
		{
			document.getElementById('rolloverDiv').innerHTML = '';
		}