function openWindow(URL,width,height)
{
  //if(URL != ""){var URL = "index.htm";}
 
  //var width =  416 ;
  //var height = 360 ;
  var yes = 1;
  var no = 0;
  var menubar = no;
  var scrollbars = no;
  var locationbar = no;
  var directories = no;
  var resizable = no;
  var statusbar = no;
  var toolbar = no;
  
  var H = (screen.height-height)/2 ;
  var W = (screen.width-width)/2 ;

   propriete = "width=" + (width) + ",height=" + (height) +  ",top=" + H +",left=" + W ;
   propriete += (menubar ? ",menubars" : "") + (scrollbars ? ",scrollbars" : "") + (locationbar ? ",location" : "") + (directories ? ",directories" : "") + (resizable ? ",resizable" : "") + (statusbar ? ",status" : "") + (toolbar ? ",toolbar" : "") ;

   popup = window.open(URL, 'TITRE',propriete) ;
}