This is where Live Web Pages for PowerPoint will be of great use...This is a small simple and easy to use add-in for PowerPoint.
You can insert Live Web Pages in a slide and can also refresh the webpage during a slideshow or live presentation.
This add-in is one from a fantastic Powerpoint add-in created by Micorosft's Most Valuable Professional Shyam Pillai.
LiveWeb - insert and view web pages real-time.
How to use this Live Web is explained Step by Step in this blog. Here is the link.
How to use Live Web Pages for Powerpoint
I recommend you to browse Shyam Pillai's site for many useful tips and PowerPoint Add-ins.