function ouvre_popup(page) {
   x=new Image;
   x.src=page;
   if ((x.width != 0) && (x.height != 0)){
   	newpage = window.open(page,"","menubar=no, status=no, scrollbars=no, width=" + x.width + ", height=" + x.height);
   } else {
	newpage = window.open(page,"","menubar=no, status=no, scrollbars=no, width=715, height=615");
   }
   //alert(x.width + " " + x.height);
}