How can I identify which textures are missing?

It looks like somewhere along the line I have managed to zap some textures - I've noticed that some buildings at the (MS) default airports now look like white boxes. Is there any way to identify which texture file(s) are missing so that I can attempt to recover them?Thanks, John.4m NW of EGHI (Southampton UK)FS2002 Standard on Intel PIII 733 MHz, 256MB with 32M GeForce2MX graphics and Windows ME.