the code looks correct. to trouble shoot, change:
$WA_redirectURL = "users_Detail.php?UserID=".((isset($_POST["WADAUpdateRecordID"]))?$_POST["WADAUpdateRecordID"]:"") ."";
to:
//$WA_redirectURL = "users_Detail.php?UserID=".((isset($_POST["WADAUpdateRecordID"]))?$_POST["WADAUpdateRecordID"]:"") ."";
$WA_redirectURL = "";
then add the following code after the <body> tag to write the sql statement being used to the page:
<?php echo("SQL: ".$WA_Sql."<br />"); ?>
post back the sql after testing