Checkbox checking

Checkbox checking

HTML

<body>
		<div id="container">
			<input value="78" type="radio" name="radio_tax_input[unit-type][]" id="in-unit-type-78">
			<input value="90" type="radio" name="radio_tax_input[unit-type][]" id="in-unit-type-90">
			<input value="3" type="radio" name="radio_tax_input[unit-type][]" id="in-unit-type-3">
		</div>
		<button id="checkButton">Check</button>
	</body>

JavaScript

$('#checkButton').click(function(){
				var checkboxes = $('#container').find('input');
				var checked = false;
				for(var x = 0; x < checkboxes.length; x++){
					var box = checkboxes[x];
					if(box.checked){
						checked = true;
					}
				}
				if(!checked){
					alert('denied');
    				return false;
				}
			});