Make content horizontally scroll inside a div

I have a division in which I wanna show images and on click open them in a lightbox. I have floated them left and displayed them inline. set overflow-x to scroll but it still puts the images below once the row space is not enough. I wanna get them to be inline and display a horizontal scroll when needed.

NOTE: I can't change the structure of the images inside. It has to be a img inside an anchor. My lightbox requires it like that.

HTML:

<div id="myWorkContent">
    <a href="assets/work/1.jpg"><img src="assets/work/1.jpg" height="190" /></a>
    <a href="assets/work/2.jpg"><img src="assets/work/2.jpg" height="190" /></a>
    <a href="assets/work/3.jpg"><img src="assets/work/3.jpg" height="190" /></a>
    <a href="assets/work/4.jpg"><img src="assets/work/4.jpg" height="190" /></a>
    <a href="assets/work/5.jpg"><img src="assets/work/5.jpg" height="190" /></a>
    <a href="assets/work/6.jpg"><img src="assets/work/6.jpg" height="190" /></a>
</div><!-- end myWorkContent -->

CSS:

#myWorkContent{
    width:530px;
    height:210px;
    border: 13px solid #bed5cd;
    overflow-x: scroll;
    overflow-y: hidden;
}
#myWorkContent a {
    display: inline;
    float:left
}

I know this is very basic but I just can't get it done. Don't know what's wrong.