Read javascript text on a website

Hi,
Using Excel web query function, how do I retrieve text created by javascript on a webpage?
So far when I do a web query, it results in a blank cell where on the web page it shows some text placed there by javascript. It's actually a countdown timer and underneath it shows the target time (both of these placed there by javascript). The countdown timer is dynamic, meaning it's counting down in real time (HH:MM:SS) and the target time underneath it is static.