A more efficient JavaScript code for a highlighting function?

Question

So this is the functionality I need to clean up:

I need to create a function where viewers can click on any word in a sentence, and it will be highlighted. However,

Answer 1

Sorry to add to the noise... my answer is very similar to Jorgs and Roberts, and it also checks for valid answers.

JS Fiddle is here:

http://jsfiddle.net/M7faZ/3/

The checkAns function uses the ID of the sentence element, to map the answer object to the selectedAnswer object.

The HTML has carefully chosen ID and classnames:

  
Can you draw an eagle?
  
She is good in painting.

And the JS has a map of answers.

// get the list
var $sentences = $('.sentence'),
    answers = {
        ans1: 'you',
        ans2: 'She'
    },
    selectedAnswers = {};

function checkAns() {
    var correct;

    for (var i in answers) {
        correct = selectedAnswers[i] === answers[i]

        $('#mark-symbol-' + i).toggleClass('smile', correct);
        $('#mark-symbol-' + i).toggleClass('sad', !correct);
    }
}

If you care about people cheating, this part should be done on the server so it's not exposed to the client.