Layer Styles Dilemma

Hello,

I'm 8 months Photoshop 7 educated and coming from Microsoft Image Composer. The transitions was difficult but I'm getting comfortable with Photoshop now, still don't know much.....

My question/problem is about the layer effects, specifically the shadows.

I have 2 layers:

1st layer has a 'Inner Shadow' at an angle of 150 degrees.
2nd layer.....I went to give it a 'Drop Shadow' of 100 degrees and notice that the 1st layer's angle has changed to '100' degrees from '150'.

Why is PhotoShop modifying the shadow effects of other layers when 1 in modified. Is this commom an how to disable it?

I know I could just create the layer in a new .psd, flatten and drag to the composition. But can't I just do it in the same .psd?

Thank You
Regards
Fess

Un-check "Use Global Light"

deker's correct. global light uses the computers "brain", and realises that a light would cast both shadows at the same angle. :|
Useful sometimes.

Deker, Satanclaus...

It was successful. Thanks for the quick response an advice.
I must have missed that in 1 of the 2 books I've read so far.

Adobe Photoshop7 in a the classroom
Adobe Photoshop 7 Web Design with GoLive

The above books were helpful in familiarizing myself with the interface/tools but not very in-depth with artistic techniques for Web Design which is what I do. I plan to purchase the below books for direction with the artsy side of Photoshop:

PhotoShop 7 Down and Dirty Tricks
PhotoShop 7 Killer Tips
The Photoshop WoW!

Can you guys can recommend any others that you've found to be helpful during the learning process.

Thanks Again..
Regards
Fess