How do you clean up blurry, grainy, poor resolution images?

Hello There!
I am very new to the Adobe Creative Suite.  I have started my journey with Photoshop CS5.1 and my boss has asked me to clean up an image that is being used as the background image on a web page.  I'm being asked to keep the dimensions of the image as-is (2448 x 2904) while reducing it's file size to about 500kb.  The reason for this request is that the background image is blurry, or grainy, or out-of-focus...or the resolution is just plain bad because it seems zoomed in too much.  I'm not quite sure, but it doesn't look professional on the site so my boss is asking me to clean it up.
To this point I have done research on how to clean up photos but nothing has fixed my problem.  What makes it worse is that I'm so new to PS that I can't be sure if I unable fix this image due to my lack of skill/knowledge, or because what is being asked of me cannot be done(due to coding issues behind the scenes of this web page, or because the image size shouldn't be 2448 x 2904 at all, etc.).
Here are some of the things I've tried to clean up this blurry, out-of-foucs, grainy image (trying to reduce the file size to around 500kb):
High Pass filter
Sharpen tool
File > Save for Web & Devices -- It was here where I was able to reduce the size to what I wanted, but the quality isn't any better than it is on the current web page
I really appreciate the help!  Hopefully I can soon give my boss a great finished product, or at least an answer as to why what he's asking cannot be done!
-Greg
*Photoshop CS5 (version 12.1 x32) on a MacBook running Snow Leopard (v 10.6.8)

bowarrowapple wrote:
 ... I'm being asked to keep the dimensions of the image as-is (2448 x 2904) while reducing it's file size to about 500kb.... ...Hopefully I can soon give my boss a great finished product, or at least an answer as to why what he's asking cannot be done!...
The best thing you can do is recognize that some client requests cannot be reasonably honored. You're on the right track to keep the answer 'No!' a possibility. 500kb is way too large for a web page.
The cure for this scenario is tinkering with CSS/HTML. Personally, I would use a repeating pattern of synthetic grass with no yard lines. That can get you down to around 20kb. Then I would overlay a PNG8 file with alpha transparency* to render the yard lines. That could be only 100kb. These images can be layered as your background through HTML/CSS.
*Photoshop cannot create PNG8 with alpha transparency. You'd need to make this with Fireworks or use this hack.

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    bowarrowapple wrote:
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