entonces cambia esta funcion
Código PHP:
function display_book_details($book)
{
// display all details about this book
if (is_array($book))
{
echo "<table><tr>";
//display the picture if there is one
if (@file_exists("http://www.forosdelweb.com/images/".($book["sku"])))
{
$size = GetImageSize("http://www.forosdelweb.com/images/".$book["sku"]);
if($size[0]>0 && $size[1]>0)
$book = $book['sku'].".jpg";
echo "<td><img src=\"http://www.forosdelweb.com/images/$book\" border=0 ".$size[3]."></td>";
}