function simpleblock(blockname) {
	/* hide some elements : */
	var initialelement = document.getElementById('initialelement');
	initialelement.style.visibility = 'hidden';

	var selectedelement = document.getElementById(blockname);
	selectedelement.style.visibility = 'visible';
}

function activateblock(type, linktype) {
	/* disable other elements : */
	var initialelement = document.getElementById('initialelement');
	initialelement.style.visibility = 'hidden';

	var messenger = document.getElementById('messenger');
	messenger.style.visibility = 'hidden';
	var messengerlink = document.getElementById('messengerlink');
	messengerlink.style.visibility = 'hidden';

	var chat = document.getElementById('chat');
	chat.style.visibility = 'hidden';
	var chatlink = document.getElementById('chatlink');
	chatlink.style.visibility = 'hidden';

	var medias = document.getElementById('medias');
	medias.style.visibility = 'hidden';
	var mediaslink = document.getElementById('mediaslink');
	mediaslink.style.visibility = 'hidden';
	var mediaslinktwo = document.getElementById('mediaslinktwo');
	mediaslinktwo.style.visibility = 'hidden';

	var blogs = document.getElementById('blogs');
	blogs.style.visibility = 'hidden';
	var blogslink = document.getElementById('blogslink');
	blogslink.style.visibility = 'hidden';

	var friends = document.getElementById('friends');
	friends.style.visibility = 'hidden';
	var friendslink = document.getElementById('friendslink');
	friendslink.style.visibility = 'hidden';
	var friendslinktwo = document.getElementById('friendslinktwo');
	friendslinktwo.style.visibility = 'hidden';

	var chatrooms = document.getElementById('chatrooms');
	chatrooms.style.visibility = 'hidden';
	var chatroomslink = document.getElementById('chatroomslink');
	chatroomslink.style.visibility = 'hidden';
	var chatroomslinktwo = document.getElementById('chatroomslinktwo');
	chatroomslinktwo.style.visibility = 'hidden';

	var convergence = document.getElementById('convergence');
	convergence.style.visibility = 'hidden';
	var operator = document.getElementById('operator');
	operator.style.visibility = 'hidden';
	var admin = document.getElementById('admin');
	admin.style.visibility = 'hidden';
	var moderation = document.getElementById('moderation');
	moderation.style.visibility = 'hidden';



	/* show given element : */
	var divelement = document.getElementById(type);
	divelement.style.visibility = 'visible';
	if (linktype != '') {
		var linkname = document.getElementById(linktype);
		linkname.style.visibility = 'visible';
		if (linktype == 'mediaslink') {
			mediaslinktwo.style.visibility = 'visible';
		}
		if (linktype == 'friendslink') {
			friendslinktwo.style.visibility = 'visible';
		}
		if (linktype == 'chatroomslink') {
			chatroomslinktwo.style.visibility = 'visible';
		}
	} else {
		/* show links again, robably in onmouseout event : */
		messengerlink.style.visibility = 'visible';
		chatlink.style.visibility = 'visible';
		mediaslink.style.visibility = 'visible';
		mediaslinktwo.style.visibility = 'visible';
		blogslink.style.visibility = 'visible';
		friendslink.style.visibility = 'visible';
		friendslinktwo.style.visibility = 'visible';
		chatroomslink.style.visibility = 'visible';
		chatroomslinktwo.style.visibility = 'visible';
	}

}