Quote: "Okay, :state= has number after it. What does it stand for? And do you know other script related lines except for :skyspeed=."
Using the example script on the page you linked...
:state=0,plrdistwithin=50:state=1,skyscroll=X
Scripts start at :state=0", so in this case that is the first line for the script. In essence, what it is happening is the script loads and says "if the player is within 50 units of something I'm attached to (a dynamic entity, trigger), then go to "state=1" and run the skyscroll command at the same time I go to "state=1".
Obviously this example uses either a trigger zone or the script is attached to another dynamic entity to trigger the skyscroll. Although I do not use this method, I am not too sure that it will actually work this way in some versions. In the version I use, I call the "skyscroll" command in either my "setuplevel.fpi" script, or if I change skyboxes per level, then I specify it in my "loadingpage#.fpi" script when I specify the skybox I want.
There's no problem that can't be solved without applying a little scripting.