Thanks for the information. Much appreciated.

There was one other thing that I mentioned in my post. The issue of continuing work on saved slices. I wonder if anyone can assist.

Here is what I have been trying to do.

I created a colour background and placed upon it a new layer. Next, I created a large rounded rectangle, used the warp tool to create a curved upper edge and filled the layer with a dark blue. Next, I created a outer glow around the filled rectangle. I then proceeded to duplicate that layer, filled it with white and removed the outer glow. Placing the white rectangle over the top of the blue one gives a very nice blue glowing outline to my white shape.

I would like to slice the image into several sections, some of which are required to remain white, some are required to be tinted in grey, and some a light-to-dark grey gradient effect. Certain areas are also required to have some various edge effects.
I realise that a fair bit of experimentation will be required before I reach the desired effect, especially for someone as new to photoshop such as myself.

Here is where I come unstuck.

When creating the grey areas on the white layer, their position needs to be very precise, so that once the image is sliced (each piece to the appropriate dimensions, say 192px x 70px) the grey will remain within that section and not overlap into the next area which may need to remain totally white.

I considered that it may be more accurate to do this once the image is sliced. I could then work on each slice seperately, whilst leaving neighbouring slices unaffected. However, once each individual slice is saved as a jpg or gif, the images become unworkable.

Is there a way that I can save slices so that they remain workable? If not, how would I precisely draw and position coloured areas on a large shape, so that they will be precisely positioned for when the image is finally sliced? If I have to do all this before slicing, should I use a new layer for each individual area effect? Is there a truly accurate way of positioning effects?

Perhaps this is something ridiculously easy, that as a beginner I am completely overlooking. If so, my apologies. Any advice gratefully received.

Oh, and by the way. What are the advantages of slicing/working on an image in 'ImageReady' as opposed to Photoshop?