javascript - Ajax, Can't load xml data -


while trying load xml data trough ajax not working.. can't see data display..

var xmlhttp = createxmlhttpreq();     function createxmlhttpreq() {     var xmlhttp;     try {         xmlhttp = new xmlhttprequest();     } catch (e) {         try {             xmlhttp = new activexobject("microsogt.xmlhttp");         } catch (e) {             alert("not supported browser");         }     }     return xmlhttp; }  function exam(id) {     if (xmlhttp.readystate == 0 || xmlhttp.readystate == 4) {         xmlhttp.open("get", "examajax.php?id=" + id, true);         xmlhttp.onreadystatechange = handleresponse;         xmlhttp.send();     } else {         settimeout(exam(), 1000);     } }  function handleresponse() {     if (xmlhttp.readystate == 4 && xmlhttp.status == 200) {         data = xmlhttp.responsexml.documentelement.firstchild.data;         document.getelementbyid("mainform").innerhtml = data;     } }

examajax.php file :

<?php     header("content-type : text/xml");     echo '<?xml version="1.0" encoding="utf-8" standalone="yes"?>';     echo '<response>';         $id = isset($_get['id']) ? intval($_get['id']) : 0;         $p = isset($_get['s_p']) ? intval($_get['s_p']) : 1;         $loadall = mysql_query("select * `questions` `testid` = $id");         $ofp = mysql_num_rows($loadall);         $selected = (isset($_get['sel']) && is_numeric($_get['sel']) && $_get['sel'] <= $ofp && $_get['sel'] >= 1) ? $_session['sel'.$p] = intval($_get['sel']) : null;         $loadquestion = mysql_query("select * `questions` `testid` = $id && `pos` = $p order -`id` desc limit 1");         while ($question = mysql_fetch_array($loadquestion)) {             ?>             שאלה <?php echo $p; ?>/<?php echo $ofp; ?>             <?php echo $question['name']; ?>             <input type="radio" onclick="select(1,<?php echo $p; ?>)" value="<?php echo $question['op1']; ?>" />             <input type="radio" onclick="select(2,<?php echo $p; ?>)" value="<?php echo $question['op2']; ?>" />             <input type="radio" onclick="select(3,<?php echo $p; ?>)" value="<?php echo $question['op3']; ?>" />             <input type="radio" onclick="select(4,<?php echo $p; ?>)" value="<?php echo $question['op4']; ?>" />             <input type="radio" onclick="select(5,<?php echo $p; ?>)" value="<?php echo $question['op5']; ?>" />             <?php         }     echo '</response'; ?>

if i'm changing innerhtml string instead of data display string .. reason doesn't load xml data.. please?


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