thanks for your help i will ask my son if he can sort it for me.You will have excuse my incompitence i am a novice on this pc i have only just started to use this since i joined your forum.
Stubbo - that sounds like your browser is set to notice errors in the forum code even when they are insignificant. A good setting if you have written a web page and want to debug it but otherwise, worthless and annoying.
If you run IE, tools->internet options->advanced->check the box to disable script debugging. That should stop the popup.