Swapping Between Web Pages

Hi there

I have got 2 web pages both which display company reports but for different topics in real time and automaticaaly refresh, we want them to be displayed on a plasma screen in the call centre,
my question is, does anyone know how I can enable them to swap every so ofter, for instance display 1 report for 2 mins then swap to the other for 2 mins and then back again on an endless loop?

Your help is much appreciated in this matter

Kind Regards

Tim