Strange image shift when enlarging canvas

[talkinggoat]

I am enlargeing a canvas to export as html in imageready, but when I center the image in dreamworks, and display it in a browser, it's off by 24 pixels from the rest of the site. It only happens when it's enlarged and I'm only enlarging it vertically, not horizontally, which is where it's off. I'm not changing anything in dreamworks, except telling the table to center, which is what I've done across the entire site. It doesn't offset, until after it's enlarged, so it's the enlargement process that's throwing something off. If I tell dreamweaver to add a 24 pixel margin to the left side, it aligns properly, but I don't want to, and shouldn't have to do this. If I view the page at a smaller resolution than the page, itself, it will display correctly, but if I increase it, it shifts. I'm stumped.