警报器AJAX,带有ajax和警报的IE8问题

function voteFunction(){

var ajaxRequest; // The variable that makes Ajax possible!

try{

// Opera 8.0+, Firefox, Safari

ajaxRequest = new XMLHttpRequest();

} catch (e){

// Internet Explorer Browsers

try{

ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {

try{

ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");

} catch (e){

// Something went wrong

alert("Your browser broke!");

return false;

}

}

}

// Create a function that will receive data sent from the server

ajaxRequest.onreadystatechange = function(){

var TYPE = document.getElementById('TYPE').value;

if(ajaxRequest.readyState == 4){

if (ajaxRequest.responseText == 'you voted allready'){alert('Du kannst pro Beitrag nur 1 x voten.')}

if (ajaxRequest.responseText != 'you voted allready'){

document.getElementById('cdm_play_video_votes').innerHTML= ajaxRequest.responseText;}

if (TYPE == 1 ){publishVideovote();}

if (TYPE == 2 ){publishImagevote();}

}

}

var videoid = document.getElementById('videoid').value;

var userid = document.getElementById('userid').value;

var queryString = "?function=vote&videoid=" + videoid + "&userid=" + userid ;

ajaxRequest.open("GET", "function.php" + queryString, true);

ajaxRequest.send(null);

}

//-->