<!--popup centree  sur l'ecran
function popup(mypage,myname,w,h)
{
	
	var LeftPosition = (screen.width-w)/2;
	var TopPosition = (screen.height-h)/2;
	var settings = 'title=\'image\',height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',directories=\'no\',location=\'no\',menubar=\'no\',status=\'no\',scrollbars=\'no\',resizable=\'no\',toolbar=\'no\'';
	//alert ('largeur : '+w+' / Hauteur : '+h );
	window.open(mypage,myname,settings);
}