function show_hide_plz(kanton) {	
	if(kanton ==''){
		var plz_layer = document.getElementById('plz_div');
		plz_layer.style.display = 'block';
	} else {
		var plz_layer = document.getElementById('plz_div');
		plz_layer.style.display = 'none';
	}
}

function modify_boxes(total_boxes){ 
	for ( i=0 ; i < total_boxes ; i++ ){ 

		if (document.getElementById('all_chk').checked == true){  
			document.getElementById('chkboxarray'+i).checked=true; 
		}else{ 
			document.getElementById('chkboxarray'+i).checked=false; 
		} 
	}  
}