You have to place your ads in a DIV tag, either the DIV's style or class needs to have the "float" attribute set (either right or left). You can learn more about floating at http://www.w3schools.com/css/pr_class_float.asp
<table border="0" cellspacing="1" width="250" align="right"> <tr> <td> Insert Adsense Code Here.... (this table is optimized for the 250X250 Square Ad) </td> </tr> </table> "right" can be replaced for "center" or "left" "250" is the width of the table, make sure you allow enough for the width of your ad This is not the only way to do it.
Yes, let's make it unnecessarily complicated. <div style="position:relative;float:left">Your ad</div>Your content Code (markup): Done.
And if you use "float: left" you can set a little "margin-right: 10px" if the ad is too close to your content, like this: <div style="float: left; margin-right: 20px;"><adcode...></div>