fpdf layout

Hi,

Im struggling with the layout formate used for the fpdf class that im using wth php to generate receipts on the fly. basically the pdf content is going all over the place when i call the variables to the printed out and i cant figure out how exactly the layout manager works no matter how much i study the examples on fpdf.org.

an example of my current output is:

http://www.substanceabuseawareness.com/invoice.pdf

the code im using to generate this so far is:

<?php
include ('db.php');
require('fpdf.php');
$cxn = @ConnectToDb($dbServer, $dbUser, $dbPass, $dbName);

if(isset($_POST["Submit"])) {

 $sql = mysql_query("Select * From tracking Where C_Pass = '" . $_POST["trackingnum"] . "'") or die ("Sql error : " . mysql_error());

 if( mysql_num_rows($sql) > 0 ) {

 $row = mysql_fetch_array($sql);
 $C_Pass = $row["C_Pass"];
 $C_Fname = $row["C_Fname"];
 $C_Surname = $row["C_Surname"];
 $C_Street = $row["C_Street"];
 $C_Street1 = $row["C_Street1"];
 $C_Town = $row["C_Town"];
 $C_City = $row["C_City"];
 $C_Country = $row["C_Country"];
 $p_id = $row["p_id"];
 $invoicedate = date("l dS of F Y ");

 $pdf=new FPDF();
 $pdf->AddPage();

 $pdf->SetFont('Helvetica','U',16);
 $pdf->Image('logo.jpg',80,10,50);
 $pdf->Ln(3);
 $pdf->SetDrawColor(0,80,180);
 $pdf->SetFillColor(230,230,0);
 $pdf->Cell(80,10,'test');
 $pdf->Ln(40);

 $pdf->SetFont('Helvetica','',12);
 $pdf->Cell(70,10,'Bill to:');
 $pdf->Ln(10);
 $pdf->Cell(100,10, $C_Fname . " " . $C_Surname);
 $pdf->Cell(10,10,'Reference No:');
 $pdf->Cell(160,10,$C_Pass);
 $pdf->Ln(10);
 $pdf->Cell(70,10, $C_Street);
 $pdf->Cell(80,10,'Invoice Date: ' . $invoicedate);
 $pdf->Ln(6);
 $pdf->Cell(70,10, $C_Street1);
 $pdf->Ln(6);
 $pdf->Cell(70,10, $C_Town);
 $pdf->Ln(6);
 $pdf->Cell(70,10, $C_City);
 $pdf->Ln(6);
 $pdf->Cell(70,10, $C_Country);
 $pdf->Ln(20);
 $pdf->Cell(70,10,'Goods Ordered:');
 $pdf->Ln(6);
 $pdf->Cell(70,10,'Invoice Total:');
 $pdf->Ln(120);
 $pdf->SetTextColor(254, 0, 0);
 //$pdf->Cell(70,10,'www.substanceabuseawareness.com');
 $pdf->Cell(500,10,'shopping@substancebuseawareness.com','c');

 $pdf->Output("invoice.pdf",true);

 }
 else {
 
   echo "You Must Enter a tracking code to view details. Please go back and enter a valid code.";
   
 }

}

?>


is there anyone that has used the class before that could help with fixing this layout problem?

thanks