Replace an image in a layer with a new one

I have an image which has pasted in Photoshop as a new layer.  I open the Photoshop file in Image Ready and I have set layered slice and roll over effect.  Now I want to replace the image with a new one but I don't want to set the layered slice and roll over effect again in Image Ready.

When I paste a new image in the Photoshop file, it always comes up with a new layer.  I don't want a new layer.  I want the new image to be pasted in the old layer so that the layered slice and roll over effect can be resued.  How can I update the old image in the Photoshop file with the new one ?
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You could try this:
. Clear the contents of the old layer
. Paste your new image (it will paste it into a new layer)
. Ctrl+E to merge the contents of your new layer into your old layer

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waycalAuthor Commented:
Thank you very much for your kind support.
I hope it was a help.
God bless!

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