function mapopupinfo()
{
var h = 700; // hauteur de la popup
var l = 600; // largeur de la popup
var PosX = ( screen.availWidth - h ) / 2; 
var PosY = ( screen.availHeight - l ) / 2; 
var option = "resizable=no,top="+PosY+",left="+PosX+",width="+h+",height="+l; 
window.open("infolondre.html","",option); 

}