// JavaScript Document

var http_request = false;

function getCategoryList(url) {

	http_request = false;

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
			// zu dieser Zeile siehe weiter unten
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}

	if (!http_request) {
		alert('Ende :( Kann keine XMLHTTP-Instanz erzeugen');
		return false;
	}
	http_request.onreadystatechange = returnSubCategory;
	http_request.open('GET', url, true);
	http_request.send(null);

}

function returnSubCategory() {

	if (http_request.readyState == 4) {
		if (http_request.status == 200) {

			if (http_request.responseXML) {

				// create HTML element ul with id="online"
				var subcategories = document.forms.search.s_unterrubrik;
				subcategories.options.length = 0;

				var xmldoc = http_request.responseXML;
				var list = xmldoc.getElementsByTagName('list').item(0);
        
				if(list) {
					var subcategories = list.childNodes;
          document.forms.search.s_unterrubrik.options[0] = new Option("Alle Unterrubriken");
					
          for(i=1; i<subcategories.length+1; i++) {
						var key  = subcategories[i].childNodes[0].firstChild.nodeValue;
						var name = subcategories[i].childNodes[1].firstChild.nodeValue;
						document.forms.search.s_unterrubrik.options[i] = new Option(name, key);
					}
				} else {
                                	document.forms.search.s_unterrubrik.options[0] = new Option("Alle Unterrubriken");
				}
			}
		} else {
			alert('Bei dem Request ist ein Problem aufgetreten.');
		}
	}

}