how all,

when is the right time to use $_GET['data']?

i want to pass value of userid from page A to page B by using popup javascript.

    $qry="SELECT * FROM dbase WHERE id='".$id."'";
    $sql=mysql_query($qry);
    $rs=mysql_fetch_array($sql);

    <script language="JavaScript">
      function myPopup() {
        window.open( "<?=$CFG->wwwroot.'/ptk/main.php?task=ptk_checkapp&id='.$rs['userid'];?>" ,"myWindow", "status = 1, height = 500, width = 500, scrollbars=yes,toolbar=no,directories=no,location=no,menubar=no, resizable='yes';" )
     } 
    </script>

calling by hyperlink:

<a href="#" onclick="myPopup()">
    <?=ucwords(strtolower($rs->nama));?>
</a>  

It seems that , the $rs['user'] dont hold any value on it. can tell me what problem or may be solution?

thank you very much.