Well, I would start by following Nogdog's advice. Validate your code.
When I cut and paste your code into a template HTML file in dreamweaver and try to validate it, I get plenty of errors.
Example, you are not closing your image tags. If you are using XHTML, you should be closing them with /> at the end.
example:
<img border="0" width="150" src={AVATAR} /><br />
I'm not sure if you are showing all the table code, but you cannot have <tr> tags outside of a table tag.. so if there is more to your table code, go through it all and make sure you have proper placement of <tr> and <td> tags, as well as making sure you close your image tags and whatnot.
Bad code will cause bad results on some browsers. I suggest entering your website's URL into the W3C Validator... it will show you the errors in your code.