function plz_dropdown(target)
{
	var url = document.location.href;
	plzuid = jQuery(target).find('option:selected').val();
	erg = url.toString().search(/plzdrop=/);
	if(erg!=-1)
		url = url.replace(/plzdrop=[0-9]{1,}/,"plzdrop="+plzuid);
	else
		url = url + "&plzdrop="+plzuid;

	document.location.href=url;
}