PS3 ProductImage Upload

Hello,

I need your help (since I'm not an expert in CSS and/or PHP):

I'd like to have the ProductImage (large image of the product) to be uploaded without decreasing its size or resolution. As of now, it is uploaded and decreased to "fit to box" with the sizes 400x400px. I'd like to have it uploaded without any modifications. Therefore, my questions are the following:

1. Can I change it's upload size without "screwing up" the CSS or (most importantly) the layout of the ProductDetail.php page?
2. If the answer is no to the first question, is there any way to fix it?
3. Can I add the third "Image Upload" field to the ProductUpload.php page on the Admin's side with adding the column to the products DB? Will that work?

My website is www.furnitureyouwant.com. If you'll go to the ProductDetail.php and will click on the image, you'll see what the problem is.

Please advise.

Thank you so much in advance.

Best regards,

Paul.