On Monday, July 1, 2002 at 12:54, Tom McMillen wrote: TM> Don't know why you get an error.... ummm...i found out why! i was using a secure connection for the child page, but not the parent page. mozilla seems to keep track of which page has opened the child window regardless of connection type, ie only does for connections of the same type. so when you try and refer to 'opener' or 'parent' or anything similar, they are null in ie and populated in mozilla. thanks for your help, darren.