First of all I use modified theme M3 (Updated)

How can I make the tabs blink whenever something new happens with a certain program? For an example, I recieve a message on MSN, how can I make the tab blink as an indicator?

http://medlem.jubii.dk/cleaver/junk/litestep.jpg

You can start be reading the docs for the tasks module used in the theme.

On a related note, you'll want to define something like
xTaskbarUpdateInterval 500
xTaskbarFlashingInterval 500
There's an issue with the module that theme uses not flashing all the time with the built-in default for those settings.

Btw, those aren't the settings to actually make it flash. You'll still have to read the docs for the tasks module it uses and figure that out. ;)

Just so you know, you're talking to an absolute newbie :) I've worked out some other problems, but then I've found new ones also. For an example, when I maximize, I get like 200 unused pixels in the bottom of the screen (shouldnt the window fit the screen?). And I got the thing flashing, but not all the time, it seems quite strange.
I don't know what docs you guys are talking about, but I'll try reading some of the stuff that is located in my Litestep folder.
Thanks anyways :)

Ok, to give you a nudge in the right direction... go in to a theme's folder, open the theme.rc in a text editor, and look for the lines that say *NetLoadModule (modulename-ver#). You can find the documents for the modules in the modules folder, aswell as the module archives themselves.

Amd I *think* from what I can remember when that theme was released, that there was a small feature forgotten when it was released that gave you those 200 unused pixels at the bottom (although I think it should be more like 30). jDesk is the module you are looking for for that issue ;)

Good luck!!