Adverts covering the whole page .. again

[Summerdogdays]

I get half way down the page ,and whatever advert is on the side ,just glides across the page and sits slap bag in the middle
Why is it doing this again.it makes Mumsnet unusable.
It's a moving advert this time ,so like an ad you watch of the TV

You need to post this on ‘site stuff’ so the admins see it