function toggle(thisname) {
	createCookie ('lastgroup',thisname,180);
	tr=document.getElementsByTagName('tr')
	for (i=0;i<tr.length;i++){
		if (tr[i].getAttribute('id')==thisname)  {
			tr[i].style.display = '';
		} else {
			if (tr[i].getAttribute('id')==(thisname.substr(0,6)))  {
				tr[i].style.display = '';
			} else {
				if (tr[i].getAttribute('id') != null  && tr[i].getAttribute('id').substr(0,5) == 'group') tr[i].style.display = 'none';
			}
		}
	}
}

var last = '';   // hoort bij toggle_old
function toggle_old (thisname) {
	if (last) {
		for (i=0;i<tr.length;i++){
			if (tr[i].getAttribute(last)){
				tr[i].style.display = 'none';
			}
		}
	}
	tr=document.getElementsByTagName('tr')
	for (i=0;i<tr.length;i++){
		if (tr[i].getAttribute(thisname)){
			if ( tr[i].style.display=='none' ) {
				tr[i].style.display = '';
			} else {
				tr[i].style.display = 'none';
			}
		} 
	}
	last = thisname;
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(i=0;i<ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return 'group1';
}