as i said: use fps_max.

thanx man,but i am not talking about fps here.
let us you have a CRT monitor,running at 1280*720,32bit color,85Mhz refresh rate,and you'r GPU is not that fast,you started the game,and decided to lower the resolution down let's say 800*600 to let the game run alittle more faster,now at 800*600 the screen became flickering,because the screen refresh rate is now 60Mhz.
that's my question:how you can change the screen refresh rate in the game??

Why dont you set this up in Windows display properties?

I think it makes not much sense to set up your CRT monitor in a game, imagine you have 10 games and all would require setting up the frequency of your monitor.

as i said before alot of games allow this in thier settings,f.i doom3-quake4-far cry2.

allot of user's doesn't know what is refresh rate or even they doesn't know how to do it in windows display properties.
but thanx any way.

http://stackoverflow.com/questions/146484/what-is-the-windows-api-to-change-screen-refresh-rate

and it's not MHz, it's just Hz.

sorry,my bad
thanx man.