<label class="radio-pretty inline checked"> <input class="radioItem"
type="radio" checked="checked" name="radio" value="1"><span>按用車日期查詢</span>
</label> <label class="radio-pretty inline"> <input class="radioItem"
type="radio" name="radio" value="2"><span>按租車標記日期查詢</span>
</label>
 

$(".radioItem").change(
		function() {
		var id = $("input[name='radio']:checked").val();
		if (id == 1) {
			$("#sign").val("Y");
		}else if (id == 2){
			$("#sign").val("N");
		}
	});