Push login script from server to user workstations

Hi guys! i've searched through internet, but couldn't find a proper solution. i have a domain controller and active directory based policy win 2003, one xserve running mac os x server 10.6.8 and alot of macs workstations. How can i push login script on all macs without adding it in login items? The script i want to store on smb or afp share disk, and will be edited from time to time. I've tried to add it on xserve from WGM, but it threw an error that current directory schema doesn't store desktop settings.

So how can i solve this?