the following code on your page:
<a href="products_detail.php?ProductID=<?php echo($row_WADAproducts['ProductID']); ?>" ><?php echo(isset($_GET["pageNum_WADAproducts"])?"&pageNum_WADAproducts=".intval($_GET["pageNum_WADAproducts"]):""); ?>
should be:
<a href="products_detail.php?ProductID=<?php echo($row_WADAproducts['ProductID']); ?><?php echo(isset($_GET["pageNum_WADAproducts"])?"&pageNum_WADAproducts=".intval($_GET["pageNum_WADAproducts"]):""); ?>" >
it occurs in a few spots