constructive criticism, suggestions on how to make my code better

I have to program an e-newsletter that was designed by a freelancer. I'm not a great programmer, but I have given it my best effort. I know there is usually more than one way to do things. I've done mine, and I'm interested constructive criticism (in regards to the html programming, not the design) and suggestions on how to make the code cleaner, better, easier, more universally acceptable. Because this is going to be an e-newsletter it is important that the file continues to use the old html inline styles and not css.

Using background images apparently is not good practice in email marketing. So any alternate solution for not using a background image on the green rounded corner title heads would be especially appreciated. I think I can fix the header and footer background image easy enough.

The e-newsletter is designed in a grid fashion. This is to allow for a variable number of articles in each distribution. In my mock up, I have correctly sized placeholder images for the header, footer, and various images. The red rectangles are also placeholders. The freelancer is coming up with a library of different images to be used in these spots when necessary. Since the number of articles will vary the design employs four versions:

Full number of articles match the grid system:
http://www.tsquared.com/newsletter/full.html

One less article than the above. The red rectangle will be an image (to be determined later) to fill the space.
http://www.tsquared.com/newsletter/oneshort.html

Two less articles than the full grid. Again, the red rectangle will be an image to fill the space.
http://www.tsquared.com/newsletter/twoshorth.html

Same as the above but turning the red box vertically instead of horizontally.
http://www.tsquared.com/newsletter/twoshortv.html

Dreamweaver displays the following errors (each just one time)  that I'm trying to learn about and correct:
Float Drop Problem
Three Pixel Text Jog