Miscellany

var xmlhttp = false;  
if (window.XMLHttpRequest) {
        xmlhttp = new XMLHttpRequest();
        xmlhttp.overrideMimeType('text/xml');
} else if (window.ActiveXObject) {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}

function Insert() {
	var theQuery = document.getElementById('email').value;

var url = '<?php bloginfo('template_directory'); ?>/insert.php?email=' + theQuery;
xmlhttp.open('GET', url, true);
xmlhttp.onreadystatechange = function() {
	if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
		document.getElementById('done').innerHTML = xmlhttp.responseText + ' ';
			} else {
document.getElementById('done').innerHTML = 'Error: insert Failed!';
			}
		};
		xmlhttp.send(null);  
	}
}