How can I resize all layers in Photoshop?

I need to resize a Photoshop graphic but need all layers to be resized proportionately. How do I go about it? I need the final graphic to be a layered PSD. I'm using Photoshop CS3.

I'm aware the answer may be very simple.

 

Create a new layer set by Layer -> new - > layer set . You will see a "folder" icon in the layer pallet. drag the required layers into that layer set. select the layer set and edit->transform. This will resize all your layers together.

 

But if you need only to resize picture why don't you use
Image > image resize ? All will be proportional (with default options in your Image Resize menu)
If you need something special to do - just ask again.

 

Either resize the entire image by going into: Image/Image size or select all the layers and hit Ctrl+T and enter a value in the text boxes.

 

Press SHIFT and select all the layers.then click the selection tool and then use the free transform option to resize it to whatever size you want!! this is the easiest way I know off