publicar datos en pdf

[dti3000]

Bueno yo tengo un problema similar pero me he kedado un poco atascado y no veo la solución. Tengo 2 archivos uno llamado mysql_table.php que es así:

<?php
require('fpdf/fpdf.php');

class PDF_MySQL_Table extends FPDF
{
var $ProcessingTable=false;
var $aCols=array();
var $TableX;
var $HeaderColor;
var $RowColors;
var $ColorIndex;

function Header()
{
//Print the table header if necessary
if($this->ProcessingTable)
$this->TableHeader();
}

function TableHeader()
{
$this->SetFont('Arial','B',12);
$this->SetX($this->TableX);
$fill=!empty($this->HeaderColor);
if($fill)
$this->SetFillColor($this->HeaderColor[0],$this->HeaderColor[1],$this->HeaderColor[2]);
foreach($this->aCols as $col)
$this->Cell($col['w'],6,$col['c'],1,0,'C',$fill);
$this->Ln();
}

function Row($data)
{
$this->SetX($this->TableX);
$ci=$this->ColorIndex;
$fill=!empty($this->RowColors[$ci]);
if($fill)
$this->SetFillColor($this->RowColors[$ci][0],$this->RowColors[$ci][1],$this->RowColors[$ci][2]);
foreach($this->aCols as $col)
$this->Cell($col['w'],5,$data[$col['f']],1,0,$col['a'],$fill);
$this->Ln();
$this->ColorIndex=1-$ci;
}

function CalcWidths($width,$align)
{
//Compute the widths of the columns
$TableWidth=0;
foreach($this->aCols as $i=>$col)
{
$w=$col['w'];
if($w==-1)
$w=$width/count($this->aCols);
elseif(substr($w,-1)=='%')
$w=$w/100*$width;
$this->aCols[$i]['w']=$w;
$TableWidth+=$w;
}
//Compute the abscissa of the table
if($align=='C')
$this->TableX=max(($this->w-$TableWidth)/2,0);
elseif($align=='R')
$this->TableX=max($this->w-$this->rMargin-$TableWidth,0);
else
$this->TableX=$this->lMargin;
}

function AddCol($field=-1,$width=-1,$caption='',$align='L')
{
//Add a column to the table
if($field==-1)
$field=count($this->aCols);
$this->aCols[]=array('f'=>$field,'c'=>$caption,'w'=>$width,'a'=> $align);
}

function Table($query,$prop=array())
{
//Issue query
$res=mysql_query($query) or die('Error: '.mysql_error()."<BR>Query: $query");
//Add all columns if none was specified
if(count($this->aCols)==0)
{
$nb=mysql_num_fields($res);
for($i=0;$i<$nb;$i++)
$this->AddCol();
}
//Retrieve column names when not specified
foreach($this->aCols as $i=>$col)
{
if($col['c']=='')
{
if(is_string($col['f']))
$this->aCols[$i]['c']=ucfirst($col['f']);
else
$this->aCols[$i]['c']=ucfirst(mysql_field_name($res,$col['f']));
}
}
//Handle properties
if(!isset($prop['width']))
$prop['width']=0;
if($prop['width']==0)
$prop['width']=$this->w-$this->lMargin-$this->rMargin;
if(!isset($prop['align']))
$prop['align']='C';
if(!isset($prop['padding']))
$prop['padding']=$this->cMargin;
$cMargin=$this->cMargin;
$this->cMargin=$prop['padding'];
if(!isset($prop['HeaderColor']))
$prop['HeaderColor']=array();
$this->HeaderColor=$prop['HeaderColor'];
if(!isset($prop['color1']))
$prop['color1']=array();
if(!isset($prop['color2']))
$prop['color2']=array();
$this->RowColors=array($prop['color1'],$prop['color2']);
//Compute column widths
$this->CalcWidths($prop['width'],$prop['align']);
//Print header
$this->TableHeader();
//Print rows
$this->SetFont('Arial','',11);
$this->ColorIndex=0;
$this->ProcessingTable=true;
while($row=mysql_fetch_array($res))
$this->Row($row);
$this->ProcessingTable=false;
$this->cMargin=$cMargin;
$this->aCols=array();
}
}
?>

y el que me genera el pdf

<?php
define('FPDF_FONTPATH','fpdf/font/');
require('mysql_table.php');

class PDF extends PDF_MySQL_Table
{
function Header()
{
//Title
$this->SetFont('Arial','',18);
$this->Cell(0,6,'registros tramp',0,1,'C');
$this->Ln(10);
//Ensure table header is output
parent::Header();
}
}

//Connect to database
mysql_connect('localhost','root','catamaran');
mysql_select_db('tramp');

$pdf=new PDF();
$pdf->Open();
$pdf->AddPage();

//Second table: specify 3 columns
$pdf->AddCol('id',20,'','C');
$pdf->AddCol('Ttulo',40,'Ttulo');
$pdf->AddCol('Fecha',40,'Fecha','R');
$prop=array('HeaderColor'=>array(255,150,100),
'color1'=>array(210,245,255),
'color2'=>array(255,255,210),
'padding'=>2);
$pdf->Table('SELECT id, Título, Fecha from p2_lp order by id',$prop);
$pdf->Output();
?>

Pero me da el típico error fpdf de cuando as enviado datos incorrectamente:
Warning: Cannot modify header information - headers already sent by (output started at C:\AppServ\www\PROYECTOS\Barcos\mysql_table.php:13 2) in C:\AppServ\www\PROYECTOS\Barcos\fpdf\fpdf.php on line 1017
FPDF error: Some data has already been output, can't send PDF file

El código lo he sacado de un script de ejemplo del site de fpdf pero no lo consigo hacer funcionar. Agradeceré alguna sugerència, grácias por adelantado.