function chkEmail(tmpStr)
{
	var email_pat = /^[a-z][a-z0-9_\.\-]*[a-z0-9]@[a-z0-9]+[a-z0-9\.\-_]*[a-z]+$/gi;
	return(email_pat.test(tmpStr))
}
function createRequestObject()
{
	var ro;
	var browser = navigator.appName;
	if(browser == "Microsoft Internet Explorer")
	{
		ro = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else
	{
		ro = new XMLHttpRequest();
	}
	return ro;
}

var http = createRequestObject();
function Subscribe()
{
	if(chkEmail(document.frmMailinglist.emailaddress.value) == false)
	{
		alert("Please enter a valid email address.");
		document.frmMailinglist.emailaddress.focus();
		return false;
	}
	emailid = document.frmMailinglist.emailaddress.value;
	act = document.frmMailinglist.acts.value;
	http.open('get', 'subscribe.php?email='+emailid+'&act='+act);
	http.onreadystatechange = handleResponse;
	http.send(null);
	return false;
}
function handleResponse()
{
	if(http.readyState == 4)
	{
		var response = http.responseText;
		if(response == "joined")
			msgtxt = "Thanks for joining in our mailing list.";
		else
			msgtxt = "You have unsubscribed from our mailing list sucessfully.";
		document.frmMailinglist.emailaddress.value = "";
		alert(msgtxt);
	}
}