PCQ + QOS simple question

In a typical environment PCQ, for example with 2Mb download and 1Mb upload for each user:
If you also want that the bandwidth allocated for each user by PCQ, prioritize web pages over the rest of the traffic, as would be done?

Is correct/posible to create childs queues in the PCQ main branch? (one for web pages, and other for no-web traffic for example)
This subqueues must be also PCQ? or default type?

I don’t found a example with this basic configuration…

please, some advice?

Check out

http://mum.mikrotik.com/presentations/CZ09/QoS_Megis.pdf
http://wiki.mikrotik.com/wiki/NetworkPro_on_Quality_of_Service

Thanks!