function referrerRequest(url, containerid){

	var request_ok = true;

	//create xmlhttp request
	var page_request = false
	if (window.XMLHttpRequest)
	page_request = new XMLHttpRequest()
	else if (window.ActiveXObject){
		try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP")
		}
		catch (e){
			try{
				page_request = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e){ 
				if (window.confirm("Geen activeX - Dat is vereist!")) {
					//window.location = "/";
				}	
			}
		}
	}
	else {
		//alert('geen activex');
		return false;
		request_ok = false;
	}

		//user data
		var date1 = document.getElementById("date1").value;
		var date2 = document.getElementById("date2").value;

		var args = 'date1=' + date1 + '&date2=' + date2;

		page_request.open('POST', url, true)
		page_request.onreadystatechange=function(){

			if (page_request.readyState == 1 || page_request.readyState == 2 || page_request.readyState == 3)
			{
				document.getElementById(containerid).innerHTML='<center><img src="/images/loading.gif" alt="Loading..." /></center>';
			}
			if (page_request.readyState == 4 )
			{
				if(page_request.status == 200) {

					//ok, change the content
					document.getElementById(containerid).innerHTML=page_request.responseText;
					request_ok = true;
				}
				else if (page_request.status == 404) {
					alert("File not found!");
					request_ok = false;
				}
				else {
					alert("Something else is wrong, server returned: ".page_request.status);
					request_ok = false;
				}
			  
			}
			
		}

		//needed for POST data
		page_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		page_request.send(args);

	delete page_request;

}

function show_referrers(arg) {

	if(arg == 'today') {
		referrerRequest('/includes/referrers.php?list=today','referrer_content');
	} 
	else {
		referrerRequest('/includes/referrers.php','referrer_content');
	}

	//zorgen dat het formulier niet echt verzonden wordt (page refresh)
	return false;
}