Browser compatibility with AJAX function
<p>I have the following AJAX function that calls a PHP file to determine if an email is present in a db.</p>

<pre><code>&lt;script language="javascript" type="text/javascript"&gt;
//Browser Support Code
function ajaxFunction(Email){

    var url="index.php?EmailCheck=Yes&amp;Email=" + Email;

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(){
    if(ajaxRequest.readyState == 4){
        if(ajaxRequest.responseText == 0) {
                    alert("Sorry that email is not registered.");
                    } else {
                    alert("Login successful.");
                    window.opener.location.reload();
                    window.close();
                    }
    }
}

ajaxRequest.open("GET", url, true);
ajaxRequest.send(null); 
</code></pre>

<p>}</p>

<p></p>

<p>Are there going to be any browsers this won't work for?  I have had some complaints from users, but I can't replicate the errors in IE, FF, or Chrome.</p>
