Can I connect 1 dimmer to 2 different levers on the same light switch?

[ray-zin]

Hi All.

I have a 4-gang wall swich for 4 different sets of lights.
2 sets of lights are dimmable. (1 way switching)

If I wanted to add 1 dimmer for the 2 switches could I do it by getting a 5-gang wall switch and adding
a dimming module and connect it to 2 switches provided the i take the watts into account?

Or is it a matter of only 1 dimmer per 1 light switch?

I saw these at builders but don't really know what I need:
http://www.learimports.co.za/Dimmers.html (Code: LED500L) - Push Button Dimmer 500W + LED Light

or would I need to get something like:
Code: LED500D
Name: Remote Dimmer 500W

to use with:

http://www.learimports.co.za/Modules.html
Code: LEMDIMW
Dim On/Off Module White

Or how could I do it?
Should i rather get a 6-gang and try squeeze 2 dimming modules into it?

I'm so confused. I hope I haven't confused you all too ;-)

Thanks in advance.