Forse provando a costruire unba tabella "invisibile" come contenitore, funziona...
codice:
<HTML><BODY>
<TABLE width="100%" cellspacing="0" cellpadding="0" border="0">
<TR><TD style="border: solid 1px">
<div style="float:left"> 
left
 
left
 
left
 
</div> 
<div style="float:right"> 
right
 
right
 
right
 
right
 
</div> 
</TD></TR>
</TABLE></BODY></HTML>