var http_requestdoEmail = false;
var URL
function makeRequestdoEmail(URL, alertFunction) {
    if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        http_requestdoEmail = new XMLHttpRequest()
    } else if (window.ActiveXObject) { // IE
        try {
            http_requestdoEmail = new ActiveXObject("Msxml2.XMLHTTP")
        } catch (e) {
            try {
                http_requestdoEmail = new ActiveXObject("Microsoft.XMLHTTP")
            } catch (e) {}
        }
    }
    if (!http_requestdoEmail) {
        alert('Giving up :( Cannot create an XMLHTTP instance')
        return false
    }
    http_requestdoEmail.onreadystatechange = function() {alertFunction(http_requestdoEmail)}
    http_requestdoEmail.open('GET', URL, true)
    http_requestdoEmail.send(null)
    return true
}

var alertContentsdoEmail = function (http_local_requestdoEmail) {
    if ( (http_local_requestdoEmail.readyState == 4)||(http_local_requestdoEmail.readyState=="complete") ) {
        if (http_local_requestdoEmail.status == 200) {
    		document.getElementById('do_email').value = http_local_requestdoEmail.responseText
        } else {
            alert('There was a problem with the request: '+URL+', '+http_local_requestdoEmail.status)
    	}
    }
}
function doEmail() {
	x = makeRequestdoEmail('ajax_email.php', alertContentsdoEmail)
	// On return, call alertContent() to display returned value
}