var currentindex = 0;
var ids = Array();
var bus = Array();

function get_prev_id() {
	currentindex--;
	if (currentindex < 0) { currentindex = ids.length - 1; }
	return ids[currentindex];
}

function get_next_id() {
	currentindex++;
	if (currentindex >= ids.length) { currentindex = 0; }
	return ids[currentindex];
}

function next_thumb() {
	var nextid = get_next_id();
	$('currentthumb').src = '/cgi-bin/thumb.pl?id=' + nextid + "&amp;width=160";
	$('currentnum').innerHTML = currentindex + 1;
	$('imgcopyright').innerHTML = bus[currentindex];
	if ($('projectimage')) { $('currentimage').src = '/cgi-bin/img.pl?id=' + nextid; }
}

function prev_thumb() {
	var nextid = get_prev_id();
	$('currentthumb').src = '/cgi-bin/thumb.pl?id=' + nextid + "&amp;width=160";
	$('currentnum').innerHTML = currentindex + 1;
	$('imgcopyright').innerHTML = bus[currentindex];
}

function zoom_thumb() {
	$('currentimage').src = '/cgi-bin/img.pl?id=' + ids[currentindex] ;
	$('projectmain').hide();
	$('projectlongdesc').hide();
	$('projectimage').show();
}

function show_main() {
	$('projectimage').hide();
	$('projectlongdesc').hide();
	$('projectmain').show();
}

function show_longdesc() {
	$('projectmain').hide();
	$('projectimage').hide();
	$('projectlongdesc').show();
}

function show_plan(id) {
	$('currentimage').src = '/cgi-bin/img.pl?id=' + id;
	$('projectmain').hide();
	$('projectlongdesc').hide();
	$('projectimage').show();
}

function archiv_navig(mysel, mytype) {
	if (mysel.value != 0) {
		$('listtype').value = mytype;
		document.archivnavig.submit();
	}
}