function updateLabel(opts) {
    document.getElementById("range_label").innerHTML = "Zasięg: " + opts.value + " km";
};

function updatePeriodLabel(opts) {
    form = document.getElementById("promote_offers");
	count_offers = 0;
	for(i=0;i<form.elements.length;i++){
		if(form.elements[i].name){
			if(form.elements[i].name.indexOf('offers_to_promote')!=-1) {
				if(form.elements[i].checked) count_offers++;
			}
		}
		if(form.elements[i].name == 'period') period_select = form.elements[i];
	}		
	xajax_recalculate_promote_offers(count_offers, period_select.value);
};