function Is() {
	agent = navigator.userAgent.toLowerCase();
	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);
	this.ns = ((agent.indexOf('mozilla') != -1) & ((agent.indexOf('spoofer') == -1) & (agent.indexOf('compatible') == -1)));
	this.ns4 = (this.ns & (this.major == 4));
	this.ns6 = (this.ns & (this.major >= 5));
	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie & (this.major < 4));
	this.ie4 = (this.ie & (this.major == 4) & (agent.indexOf("msie 5.0") == -1));
	this.ie5 = (this.ie & (this.major == 4) & (agent.indexOf("msie 5.0") != -1));
	this.ie501 = (this.ie & (this.major == 4) & (agent.indexOf("msie 5.01") != -1));
	this.ie55 = (this.ie & (this.major == 4) & (agent.indexOf("msie 5.5") != -1));
	this.ie6 = (this.ie & (agent.indexOf("msie 6.0")!=-1) );
}

function klapOpen(id, countitems){
	var is = new Is();
	if(!is.ie5){
		document.getElementById(id).className = 'active';
		for (i=0; i < countitems; i++) {
			var idname = 'tn' + (i+1);
			if (idname != id) {
				if (document.getElementById(idname) != null) {
					document.getElementById(idname).className = 'notactive';
				}
			}
		}
	}
}

function klapDicht(id){document.getElementById(id).className = 'notactive';}