Server 2003 User Group Policy

Hi,

This issue isnt crucial but im tyring to work out if there is a way of doing this.

We used to set desktop wallpaper through login scripts via group policy. However, I want users to be able to change their desktop, but set a default one through group policy.

Basically, if a user has not set their own, use the default wallpaper, but if a user has set their own, keep that wallpaper, even when they login again.

I know its a bit of a lame problem but just wondering there is a way of doing this.

Thanks