JPG quality issues

I design wedding albums using InDesign CS5. My high res JPGs are about 8x12 inches at 300DPI, and my album page size is 10x15 inches. When I insert a JPG into the layout and resize it to 10x15 and export (maximum quality, 300DPI) there are severe artefacts clearly visible on screen and in print.
However when I just open up the original JPG and resize in Photoshop it is much, much cleaner. See an example here: http://www.photosbyjay.com.au/files/indesign-pain.jpg . There has been some sharpening applied but the artefacts are still just as bad before sharpening.
Can someone tell me what I'm doing wrong? If I don't size the JPGs up larger than their 8x12" size in InDesign they export fine. Is this a limitation of InDesign - does it have bad upscaling algorithms? One would assume they'd use Photoshop technology.
Any help is greatly appreciated.
Jay

@John - I'm not doing the printing myself, I'm exporting and sending to my pro lab. The issue I'm having is the InDesign JPG exported file is showing terrible artefacts
Wait...are you exporting a JPEG from InDesign and sending that to your printer?
No no no no!
This isn't the only problem you'll have if you do that. The only kind of file you should send to your printer is a PDF exported from InDesign. If you save your work as a JPEG, you will certainly lose quality.
(Yes, the method you're using can make it a little bit better. But not really. And there will always be problems with text and lines and things with sharp edges -- because JPEG, by its very nature, cannot express those things without artifact).
Is there some reason you believe you are limited to JPEG? If so, it may be time to find a new printer.

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    David is right, this is really a topic for the other forums.
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    I am a volunteer, and not a paid staff of Lenovo or Microsoft

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