[JavaScript][HTML]motools getElementsByClassName is not a function Opcje

[casperii]

Panowie mam kod:

[HTML] pobierz, plaintext 
function load_calendar(el,month,year){
	var req = new Request({
		async:false,
		method: 'get',
		url: url_ajax_cal,
		data: {
			'id_item':id_item,
			'month':month,
			'year':year,
			'lang':lang
		},
		evalScripts:true,
		onRequest: function() { 
			el.set('html','<img class="img_loading_month" src="'+img_loading_month+'">');
		},
		onSuccess: function(response) {
			el.set('html',response);
 
			$('the_months').getElementsByClassName('.weekend').each(function(el) {
			});
 
			if(clickable_past=="off"){
				$('the_months').getElementsByClassName('.past').each(function(el) {
					el.set('opacity','0.6');
				});
			}
 
		}
	}).send();
}
[HTML] pobierz, plaintext 

konsola krzyczy do tego:
$('the_months').getElementsByClassName('.weekend').each(function(el) {


html:

[HTML] pobierz, plaintext 
<li class=" clickable weekend " id="date_2017-07-01" title="1/07/2017 - Wolne" data-date="1/07/2017" style="cursor: pointer; visibility: visible; zoom: 1; opacity: 1;">1</li>
[HTML] pobierz, plaintext 

[markuz]

Nie odróżniasz zwykłego JavaScript DOM od jQuery..
$ to selector jQuery.
getElementsByClassName to czysty JavaScript.
Co oznacza 'the_months' według Ciebie?