I want the PHP mysql_query call to retrieve user values based on the Agency drop-down value but I can't get this to work. Am I unable to include the Javascript variable agency.value in PHP? <script type="text/javascript"> var agency = document.getElementById("agency"); var user = document.getElementById("user"); agency.onchange = onchange; // change options when agency is changed function onchange() { <?php include 'dbConnect.php'; ?> <?php $q = mysql_query("select id as UserID, CONCAT(LastName, ', ' , FirstName) as UserName from users where Agency = " . ?>agency.value<?php . " order by UserName");?> option_html = "<option value=0 selected>- All Users -</option>"; <?php while ($row1 = mysql_fetch_array($q)) {?> if (agency.value == 0 || agency.value == '<?php echo $row1[AgencyID]; ?>') { option_html += "<option value=<?php echo $row1[UserID]; ?>><?php echo $row1[UserName]; ?></option>"; } <?php } ?> user.innerHTML = option_html; } </script>