Why won't my images align properly?

Answer 1

try setting your cellspacing and cellpadding in your table to 0px.

your image might be too large for the space based on some padding you aren't aware of.

also, you could set the padding of your cell:

<td style="padding: 0px;"...

Answer 2

I place the banner image in a table cell

Don't do that. This isn't 1997.

Wrap the image in a div, set the background image on the div. Adjust the padding, border and margin of the div to fit. Adjust the vertical-align of the image.