How to identify the chosen selector in jQuery?
<pre><code>$('#select_id1, #select_id2, #select_id3').change(function() {
    // If '#select_id1' has changed, 'str' should be equal to 'select_id1'.
    // If '#select_id2' has changed, 'str' should be equal to 'select_id2'.
    // If '#select_id3' has changed, 'str' should be equal to 'select_id3'.
    str = &lt;what should be here ?&gt;
});
</code></pre>
