function showVisitors(){
	var besucher = document.getElementById("besucher");
	
	var jetzt = new Date();
	var a = new Date(jetzt.getTime() );
	var mytime = jetzt.getTime() + (1000*60*5);
	
	var gespeichert = "";
	if (document.cookie) {
		gespeichert = document.cookie;
	} else {
		document.cookie = "Zeitstempel=" + mytime+";";
	}
	var a = document.cookie;
	cookiewert = a.substr(a.search('=')+1,a.length);
	if(((cookiewert - jetzt.getTime()) < 1) || (gespeichert == "")){
		getVisitors("inkrement");
		document.cookie = "Zeitstempel=" + mytime+";";
	}
	besucher.appendChild(document.createTextNode("Besucher gesamt: "+getVisitors("get")));

}
function getVisitors(action){
	query=(window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject("MICROSOFT.XMLHTTP");
	if (query==null){
		alert('incompatible web-browser');
		return;
	}
	var url = './php/visitors.php?action='+action;
	query.open('GET',url,false);
	query.setRequestHeader("Pragma", "no-cache");
	query.setRequestHeader("Cache-Control", "must-revalidate");
	query.setRequestHeader("If-Modified-Since", document.lastModified);
	query.send(null);
	return query.responseText;
}