Need your help(very simple)

Sat, 09 Jul 2011 18:38:22 -0700

I am an novice. In this case, i don't know why the value of
id "title" cannot pass to function,update. I need you

<html>
<head>
<script language="javascript">
function update(title,message){
var xmlHttp;
var url="process.php?Name="+title+"&Message="+message;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlHttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}

xmlHttp.onreadystatechange=function()
{
if (xmlHttp.readyState==4 && xmlHttp.status==200)
{
document.getElementById("txtUpdate").innerHTML=xml Http.responseText;
}
}
xmlHttp.open("GET",url,true);
xmlHttp.send();

}

</script>
<title>Main</title>
</head>

<body>
<form>
<table border=1>
<tr><td colspan=150><input type="text" value="input" id="title"></td><td colspan=5>num</td></tr>
<tr rowspan=30><td colspan=150><textarea rows="10" cols="40" id="message"> Put your Message Here!</textarea></td><td>

<input type="button" value="輸入" onclick="update(title.value,message.value)"><div id="txtUpdate"></div></td></tr>
</table>
</form>
</body>
</html>

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Need your help(very simple)