function infosup() 
{ 
top.name = "main_window"; 
var popupURL = "infos.html"; 
var popup = window.open(popupURL,"infos",'toolbar=0,location=0,directories=0,status=0,top=80,left=700, menubar=0,scrollbars=0,resizable=0,width=350,height=450'); 
if( navigator.appName.substring(0,8) == "Netscape" ) 
{ 
popup.location = popupURL; 
popup.opener = self; 
} 
}