scusa ma ti faccio vedere come è il problema:
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title></title>
<link href="imm/style.css" rel="stylesheet" type="text/css" />
</head>

<body background="imm/fondo.png" class="center">
<div class="centrato" id="tutto">
  <blockquote>
    <p align="center" class="Stile2">[img]imm/angolo_sinistro.gif[/img][img]imm/barra_tra_spigoli.jpg[/img][img]imm/ang_sup_des.gif[/img]
      [img]imm/barra_centrale.jpg[/img]
      <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="920" height="90">
        <param name="movie" value="imm/bar.swf" />
        <param name="quality" value="high" />
        <embed src="imm/bar.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="920" height="90"></embed>
      </object>
    [img]imm/ang_bass_sin.gif[/img][img]imm/barra_tra_spigoli.jpg[/img][img]imm/ang_bass_des.gif[/img]</p>
  </blockquote>
</div>
</body>
</html>
lo script cssè il seguente:
codice:
html, body {
  text-align: center;    /* per far contento IE6- */
  font-size: 100%;
  width: 95%;           /* altrimenti il margin sotto non ha riferimenti */
}
#tutto {
	text-align: center;        /* per correggere il center del body */
	height: auto;
	width: auto;
	margin-top: 0;
	margin-right: auto;
	margin-bottom: 0;
	margin-left: auto;
}
.center #tutto .Stile2 img {
}