How to get a collection of divs with jquery?

I want to get the second img:

<form id="formElem" name="formElem" action="" meth开发者_运维知识库od="post">
                    <fieldset class="step">
                        <img src="1.jpg" >
                    </fieldset>
                    <fieldset class="step">
                        <img src="2.jpg" >
                    </fieldset>
                    <fieldset class="step">
                        <img src="3.jpg" >
                    </fieldset>
                </form>

I tried doing something like:

var imgSRC = $("div[id ='step']").get(1).find('img').attr('src'); 
alert(imgSRC);

Got nothing....

---

Use it like this:

var imgSRC = $('#formElem').find('fieldset').eq(1).find('img').attr('src');

or...

var imgSRC = $('#formElem fieldset:eq(1) > img').attr('src');

While the former is more to type, it's faster. Since the latter invokes the Sizzle to query the element, it's less to type but also slower!

References: .find(), .eq()