code 2 colonne:
<style type="text/css">body {background-image: url("http://img254.imageshack.us/img254/9761/fondoftits2columnas.jpg"); background-position: center; background-repeat: no-repeat; background-attachment: fixed; }</style><div id="tag" style="position:absolute; left:0px; top:30px; z-index:50; width:150px; height:45px;"><a href="http://decoratublog.blogspot.com/" target="_blank"><img border="0" src="http://img385.imageshack.us/img385/9625/decoratubloggq6.jp
" /></a></div>

code 3 colonnes:
<style type="text/css">body {background-image: url("http://img168.imageshack.us/img168/9528/fondoftits3columnas.jpg"); background-position: center; background-repeat: no-repeat; background-attachment: fixed; }</style><div id="tag" style="position:absolute; left:0px; top:30px; z-index:50; width:150px; height:45px;"><a href="http://decoratublog.blogspot.com/" target="_blank"><img border="0" src="http://img385.imageshack.us/img385/9625/decoratubloggq6.jpg" /></a></div>