Would anyone know the cause of the following issue:

We have a website which is developed in php - www.paraffin.co.za/sawc

Throughout the copy of the website some of the words are highlighted in blue and if you rollover it then a popup appears with an image and some sort of special. There are loads and all different things appearing.

I have seen this issue on the clients machine, my machine now and another machine too.

I will appreciate any help here.

Thanks,
Lance