Javascript ...
window.onload = function() {
var chk = document.getElementById('CheckboxIdHere')
chk.onclick = function() {
var lbl = document.getElementById('LabelIdHere')
lbl.innerHTML = (this.checked) ? "Yes" : "No";
}
}
JQuery ...
$(function() {
$("#CheckboxIdHere").click(function() {
$("#LabelIdHere").html(($(this).is(":checked")) ? "Yes" : "No");
});
});