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You need some CSS to do this. The easiest way is to put a div around your AdSense code. For example:
<div style="float: left;">
Here your AdSense script
This should do the trick. You could also use "float: right" to put the AdSense block on the other side of the page.
Errm... WW, I don't know how to say this to you but that <table align="left"> stuff is seriously deprecated. You are slowing your pages down and limiting your creativity with this kind of code. Not to mention giving yourself extra work. Using CSS instead will free you up in at least three ways!
Some of the people there (not me) number amongst the most highly qualified CSS designers on the planet.
I first dipped my toe in the water in August 2003 and have been in love with it ever since.