php cart throwing page not found

for example it is throwing page not found error  this is the output ex...  /addtocart.php?id=1025  I will attach a couple of pages.

First is the page to pull the database.

second is the addtocart.php

third is the

<?php
	require_once('library/init.php');
	
	$page['products'] = $catalog->getCategories();
	$scInfo = $catalog->getSubCategoryInfo($core->pageVar('sCatID', siteCore::VARTYPE_INT));
	
	$page['content'] = "<h2><a href=\"category.php?catID=" . $scInfo['category']['id'] . "\">" .
						$scInfo['category']['name'] . "</a>&nbsp;&gt;&nbsp;" . $scInfo['name'] .
						"</h2>\n<div class=\"mainContent\">\n";
	$lastProdID = 0;
	$lastWeight = 0;
	$lastBrand = 0;
	$first = 0;
	$last = 0;
	if(count($scInfo['products']))
	{
		$page['content'] .= "<ul>\n";
		foreach($scInfo['products'] as $productID => $productInfo)
		{
			if(($lastProdID!=$productInfo['ProductIDtwo'] || $lastWeight!=$productInfo['weight']) && $last == 1)
			{
				$page['content'] .= "</table>";
				$last = 0;
			}
			if($lastBrand!=$productInfo['brandID'])
			{
				if($first != 1)
				{
					$page['content'] .= "</table>";
				}
				$first = 2;
				$lastBrand = $productInfo['brandID'];
				$page['content'] .= "<h3><a href=\"brand.php?bID=$lastBrand\">" . $productInfo['brand'] . "</a></h3>";
				$page['content'] .= "<table border=\"0\">";
			}
			
			if($lastProdID!=$productInfo['ProductIDtwo'] || $lastWeight!=$productInfo['weight'])
			{
				$page['content'] .= "<tr><td>";
				//Delete this & update dB
				if($productInfo['productPic'] == NULL) $productInfo['productPic'] = 'No Image.gif';
				$page['content'] .= "<img src=\"Images/Product Images/" . $productInfo['productPic'] .  "\" />";
				$page['content'] .= "</td><td>";
				$page['content'] .= "<name>" . $productInfo['name'] . "</name><br></a>";
				if($productInfo['numUnits'] !== NULL) $page['content'] .= $productInfo['numUnits'] . "/";
				$page['content'] .= $productInfo['weight'];
				$page['content'] .= " " . $productInfo['unit'] . "<br>";
				$page['content'] .= "$" . $productInfo['price'] . "\n";
				$lastProdID = $productInfo['ProductIDtwo'];
				$lastWeight = $productInfo['weight'];
				if($productInfo['flavor'] == NULL)
				{
					$page['content'] .= "<h8><a href=\"addtocart.php?id=$productID\">" . "  <form action='addtocart.php' method='post'>
      <input type='hidden' name='productid' value='$pid'/>
      <input type='submit' value='Add To Cart'/>" . "<br></a></h8>";
				} else {
					$page['content'] .= "<table cellpadding=\"0\" cellspacing=\"0\"><td>";
					$page['content'] .= $productInfo['flavor'] . "&nbsp&nbsp</td>";
					$page['content'] .= "<td><h8><a href=\"addtocart.php?id=$productID\">" . "  <form action='addtocart.php' method='post'>
      <input type='hidden' name='productid' value='$pid'/>
      <input type='submit' value='Add To Cart'/>" . "<br></a></h8></td></tr>";
					$last = 1;
				}
			} else {
				$page['content'] .= "<tr><td>";
				$page['content'] .= $productInfo['flavor'] . "&nbsp&nbsp</td>";
				$page['content'] .= "<td><h8><a href=\"addtocart.php?id=$productID\">" . "  <form action='addtocart.php' method='post'>
      <input type='hidden' name='productid' value='$pid'/>
      <input type='submit' value='Add To Cart'/>" . "<br></a></h8></td></tr>";
				$last = 1;
			}
		}
	}
	$page['content'] .= "</td></tr></table></table>";
	$page['content'] .= "</div>";
	
	print_page();
?>
 
 
 
addtocart.php
 
 
<?php
 
/**
 * First things first, get the product id that is to be added.
 */
if (isset($_POST['productID']))
{
  /**
   * By forcing this into int format, we avoid SQL Injection.
   */
  $pid = intval($_POST['productID']);
}
else
{
  throw new IllegalProductIDException();
}
 
/**
 * Next, have the CartManager go and add an entry for this pid
 * in the shopping cart.  It is smart enough to know to
 * see if there is an existing entry in the cart and simply
 * increment the number of items desired when it exists.
 *
 * This method throws if it is not given a valid product id.
 */
$cm = CartManager::getInstance();
$cm->addProductToUserCart($pid);
 
/**
 * Great.  Now redirect them to the page to show them the
 * contents of their cart.
 */
header('Location: SHOWCART.PHP');
 
 
?>
 
 
showcart.php
 
 
<?php
 
ob_start();
$page_title = "Shopping Cart Contents";
 
require_once('coreincs.inc');
require_once('pagetop.inc');
 
 
/**
 * First, make sure there is a valid session.
 */
$sid = session_id();
if ($sid === NULL or $sid == '' or !isset($_SESSION))
{
  throw new NoSessionException();
}
 
/**
 * Now get the cart information from the session data.
 */
$cm = CartManager::getInstance();
$cart = $cm->getCartContents();
?>
 
<font class='pageBody'>
 
<!--
    Keep Shopping and Proceed to Checkout buttons
 -->
<br/>
<table align='center' width='50%' border='0' cellspacing='0'
       cellpadding='0'>
<tr>
  <td width='50%' align='right'>
<form action='showprods.php'>
  <input type='submit' value='Keep Shopping'/>
</form>
  </td>
  <td width='50%' align='left'>
<form action='checkout.php' method='post'>
  <input type='submit' value='Proceed to Checkout'/>
</form>
  </td>
</tr>
</table>
 
<!--
     Title row for the main shopping cart table
  -->
<table align='center' border='1' width='90%' cellspacing='0'
       cellpadding ='4'>
<tr>
  <td width='40%'><br/><b>Title:</b></td>
  <td width='20%'><br/><b>Price Each:</b></td>
  <td width='20%'><br/><b>Quantity:</b></td>
  <td width='20%'><br/><b>Total:</b></td>
</tr>
 
<?php
/**
 * Okay, now go and create one row for each type of item in
 * the shopping cart
 */
$subtotal = 0.0;
if (count($cart) == 0)
{
  echo <<<EOTR
<tr>
  <td colspan='4'>
    Your shopping cart is empty at this time.
  </td>
</tr>
EOTR;
}
else
{
  echo <<<EOTEXT
<tr>
  <td colspan='4'>
    <table border='0' width='100%' cellspacing='0' cellpadding='0'>
EOTEXT;
 
  foreach ($cart as $cartentry)
  {
  
    $total = (float)($cartentry->PricePerUnit)
                     * $cartentry->NumItems;
    $subtotal += $total;
    echo <<<EOTR
    <tr>
      <td width='40%' valign='top' align='center'>
        {$cartentry->Title}
      </td>
      <td width='20%' valign='top' align='center'>
        {$cartentry->PricePerUnit}
      </td>
      <td width='20%' valign='top' align='left' valign='center'>
        <form action='updatequantity.php' method='post'>
          <input type='hidden' name='productid'
                 value='{$cartentry->ProductID}'/>
          <input type='text' size='2' name='quantity'
                 value='{$cartentry->NumItems}'/>
          <input type='submit' value='Update'/>
        </form>
      </td>
      <td width='20%' valign='top' align='center'>\$$total</td>
    </tr>
 
EOTR;
  }
 
  echo <<<EOTEXT
    </table>
  </td>
</tr>
EOTEXT;
}
?>
 
 
<!--
    Subtotal row for the shopping cart table.
 -->
<tr>
  <td colspan='3' align='right'>
    Subtotal:&nbsp;&nbsp;
  </td>
  <td align='center' width='20%'>
    <b>$<?php echo $subtotal; ?></b>
  </td>
</tr>
</table>
 
<!--
    One more set of "Keep Shopping" and "Proceed to Checkout"
    Buttons.
 -->
<br/>
<table align='center' width='50%' border='0' cellspacing='0'
       cellpadding='0'>
<tr>
  <td width='50%' align='right'>
<form action='showprods.php'>
  <input type='submit' value='Keep Shopping'/>
</form>
  </td>
  <td width='50%' align='left'>
<form action='checkout.php'>
  <input type='submit' value='Proceed to Checkout'/>
</form>
  </td>
</tr>
</table>
</font>
 
 
<?php
/**
 * Close out the page.
 */
require_once('pagebottom.inc');
ob_end_flush();
?>

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