Most browsers place that part of the content "on top" of the left-hand
table, and some "only" do it when the browser window is resized to a low
enough width (best guess by eye measuring it, I'd say about 1000 pixels
wide). Here are screenshots using all browsers I have installed on my
system:
http://capture.kimandre.com/usenet/...ture.kimandre.com/usenet/trnje_hr_safari5.jpg
A casual look using Opera's element inspector (Dragonfly) tells me the
left-hand image is placed using absolute positioning. Giving it a negative
positioning value (your "left" property is set to -14px) is not a stable
method, and can easily affect your other content.
If your goal is to place that image to the left of your content anyway
(and the image is not meant to cover, or to be covered by, other content),
I'd do this differently.
But as others have said, you may want to run your site through the
validators to find potential (other) problems with your code.