What is the name of variable changed by time ??? like timer() in lite-c. In d3d variable is called Time, but this engine is not recognizing it.

there is no variable changed by time, but time_frame is the exact time that the kast frame took to be rendered. you can write a function to add up time_frame so that variable changes by the time. (there is also time_step, check the manual)

I am talking about shaders ... is there any variable in shaders language changed by time ? if not, is there any way that I can pass it to shader from main script ???

yes, that's all explained in manual.
http://www.conitec.net/beta/shader-var.htm

any other way ? my version is 7.25 xD

the other ways could possibly be not using WAREZ or if you already dont, update to 7.80, updates are free to those who PURCHASED a license.

Look up "vecTime" in the manual.

Jibb