oleglantukh,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script>
document.addEventListener('DOMContentLoaded', function() {
var a =document.querySelectorAll('[data-id]');
[].forEach.call(a, function(link) {
var id = link.dataset.id,
el = document.getElementById(id);
link.addEventListener("click", function(event) {
event.preventDefault();
el.checked = !el.checked
})
});
});
</script>
</head>
<body>
<a href="javascript:void(0);" data-id="continent-1">Африка</a>
<a href="javascript:void(0);" data-id="continent-2">Азия</a>
<a href="javascript:void(0);" data-id="continent-3">Европа</a>
...
<input type="checkbox" id="continent-1">
<input type="checkbox" id="continent-2">
<input type="checkbox" id="continent-3">
</body>
</html>