var xmlHttp; 

function GetXmlHttpObject() { 
    var xmlHttp=null;

    try {
    // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
    }
    catch (e) {
    // Internet Explorer
        try {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
} 

function subscribe(email) {

	xmlHttp=GetXmlHttpObject()
    	if (xmlHttp==null) {
            alert ("Cannot create xmlHttp object!");
            return;
    	}

	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open('get', '/simplephpmaillist/maillist.php?email='+email+'&action=subscribe');
	xmlHttp.send(null);
}

function stateChanged() {
    
    	if(xmlHttp.readyState == 4) { 
	    alert(xmlHttp.responseText);
      	} 
}