function ajax(url)
{
	alert('hi');
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET",url+ "?piestwit=" + document.forms[0].piestwit.value,false);
xmlhttp.send(null);
if(document.getElementById('response')) {
	document.getElementById('response').innerHTML=xmlhttp.responseText;
}
}