function ajax_anfrage(url, div_id){
	// console.log("URL: " + url);
	// console.log("div_id: " + div_id);
	// alert(url);
	
	//erstellen des requests
	var req = null;
	try{
		req = new XMLHttpRequest();
	} catch (ms){
		try{
			req = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (nonms){
			try{
				req = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (failed){
				req = null;
			}
		}
	}
	if (req == null) {
		alert("Error creating request object!");
	}
	
	//anfrage erstellen (GET, url ist localhost,
	//request ist asynchron
	req.open("GET", url, true);

	//Beim abschliessen des request wird diese Funktion ausgef�hrt
	req.onreadystatechange = function(){
		switch(req.readyState) {
			case 4:
				if(req.status != 200) {
					alert("Fehler bei Ajax-Anfrage:" + req.status); 
				} else {
					// alert(req.responseText);
					// schreibe die antwort in den div container mit der id content
					
					if(document.getElementById(div_id) != null){
						document.getElementById(div_id).innerHTML = req.responseText;
					} else {
						parent.document.getElementById(div_id).innerHTML = req.responseText;
					}
				}
			break;
			default:
				return false;
			break; 
		}
	};
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	req.send(null);
}