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JScript code:

var xmlHttp;
function createXHR(){
if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}

if(!xmlHttp) {
alert('ÄúʹÓõÄä¯ÀÀÆ÷²»Ö§³ÖXMLHTTPÎï¼þ');
return false;
}
}

function sendRequest(){
createXHR();
var url='register_check.php';
window.status='Checking customer ID...';
xmlHttp.open('GET',url,true);
xmlHttp.onreadystatechange=catchResult;
xmlHttp.send(null);
}

function catchResult(){
if (xmlHttp.readyState==4){
s=xmlHttp.responseText;
if (xmlHttp.status == 200) {
if (s=='true'){
document.getElementById('alert_account').innerHTML='這個帳號Òѱ»Ê¹ÓÃ';
}
else{
document.getElementById('alert_account').innerHTML='這個帳號¿ÉÓÃ';
}
}
}
}



HTML code:

<div class="attribute account">
<label for="account"&g