function agrandissement(categorie)
{

document.getElementById('promotion').src='Images/presta_'+categorie+'/tarifs_'+categorie+'.jpg';

document.getElementById('gris').style.width = '100%';
document.getElementById('gris').style.height = '100%';
document.getElementById('gris').style.visibility = 'visible';


document.getElementById('pub').style.visibility = 'visible';
document.getElementById('pub').style.width = '100%';
document.getElementById('pub').style.height ='100%';


var size;
var LargeurImg = document.getElementById('promotion').width ;
var LargeurScreen = document.getElementById('gris').offsetWidth;
if (LargeurImg > LargeurScreen){size = LargeurScreen;}
else {size = LargeurImg;}


document.getElementById('promotion').width = size - 50;

}

function closeSup()
	{
	if(document.getElementById)
		{
		document.getElementById("gris").style.visibility = 'hidden';
		document.getElementById("pub").style.visibility = 'hidden';
		
				document.getElementById('pub').style.width = '0%';
		document.getElementById('pub').style.height ='0%';

				document.getElementById('gris').style.width = '0%';
		document.getElementById('gris').style.height ='0%';

		}
	}