#leftcontent { position: absolute; left:10px; top:50px; width:200px; background:#fff; border:1px solid #000; }
testo a sx
#centercontent { background:#fff; border:1px solid #000; margin-left: 201px; margin-right:201px; }
testo al centro
text
text
#rightcontent { position: absolute; right:10px; top:50px; width:200px; background:#fff; border:1px solid #000; }
right text
some text
some text
some text
some text
some text
some text