I am pretty new to php so I just am just poking and prodding at this point.  I have built a page that uses url parameters that returns info based one 1 variable.  What I am trying to do is if the binding variable does not exist in the database I want to redirect to a page. 1) is this possible 2)If possible how can I do it?

<?php

if (!function_exists("GetSQLValueString")) {

function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")

{

  if (PHP_VERSION < 6) {

    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;

  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {

    case "text":

      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";

      break;   

    case "long":

    case "int":

      $theValue = ($theValue != "") ? intval($theValue) : "NULL";

      break;

    case "double":

      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";

      break;

    case "date":

      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";

      break;

    case "defined":

      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;

      break;

  }

  return $theValue;

}

}

$colname_rsTour = "-1";

if (isset($_GET['tourID'])) {

          $colname_rsTour = $_GET['tourID'];

}

mysql_select_db($database_hometours, $hometours);

$query_rsTour = sprintf("SELECT property.tourId, property.address, property.price, agent.firstname,agent.lastname,property.beds, property.baths, property.sqft, property.mlsId, property.slidexml, dsrLink FROM property, agent WHERE property.tourId = %s AND property.agentId = agent.agentId ", GetSQLValueString($colname_rsTour, "int"));

$rsTour = mysql_query($query_rsTour, $hometours) or die(mysql_error());

$row_rsTour = mysql_fetch_assoc($rsTour);

$totalRows_rsTour = mysql_num_rows($rsTour);

mysql_free_result($rsTour);

?>

SO basically if the tourID is not in the database I want to redirect to another page.

Thanks in advance.