var ztabs=new Array();

function ztab_chglight(ctrl_hid, act) {
	var o, hcn, thid;

	hcn = act ? 'ztab_act' : 'ztab_iact';

	thid = 'ztab_'+ctrl_hid;

	o = document.getElementById(thid+'_0');
	if (o) o.className = hcn + '_left';

	o = document.getElementById(thid+'_1');
	if (o) o.className = hcn + '_mid';

	o = document.getElementById(thid+'_2');
	if (o) o.className = hcn + '_right';
}

function ztab_chgact(ctrl_hid, act) {
	var o, dhid;

	ztab_chglight(ctrl_hid, act);

	dhid = 'ztabd_'+ctrl_hid;

	o = document.getElementById(dhid);
	if (o) o.style.display = act ? '' : 'none';
}

function ztab_l(ctrl_id, tab_id, light) {
	ztab_chglight(ctrl_id+'_'+tab_id, light);
}

function ztab_a(ctrl_id, tab_id) {
	ztab_chgact(ctrl_id+'_'+ztabs[ctrl_id], false);
	ztab_chgact(ctrl_id+'_'+tab_id, true);
	ztabs[ctrl_id] = tab_id;
}