The [font=Arial, sans-serif]Webmaster Tools has following code for a better 404 page - they say to [/font][font=Arial, sans-serif]copy the code below and paste it into your 404 page between the [/font][font=Arial, sans-serif] and [/font][font=Arial, sans-serif] tags.
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Where it should be pasted in Cs cart 4.0.3 ?