[html] CSS show div background image on top of other contained elements

Not sure if this is possible and how, but I tried playing around with the z-index of the elements in my code with no success.

I have a div element that has a background image set in css. inside the div, i have other elements, like div and img. I am trying to have the main div that contains the background image stay on top, since I want that background image to show on top of the other elements (this background image has some rounded corners that I want to show on top of the image included in this div).

Example HTML:

<div id="mainWrapperDivWithBGImage">
   <div id="anotherDiv">
      <!-- show this img behind the background image 
      of the #mainWrapperDivWithBGImage div -->
      <img src="myLargeImage.jpg" />
   </div>
</div>

Example CSS:

/* How can I make the bg image of this div show on top of other elements contained
   Is this even possible? */

#mainWrapperDivWithBGImage {
  background: url("myImageWithRoundedCorners.jpg") no-repeat scroll 0 0 transparent;
  height: 248px;
  margin: 0;
  overflow: hidden;
  padding: 3px 0 0 3px;
  width: 996px;
}

How about making the <div id="mainWrapperDivWithBGImage"> as three divs, where the two outside divs hold the rounded corners images, and the middle div simply has a background-color to match the rounded corner images. Then you could simply place the other elements inside the middle div, or:

#outside_left{width:10px; float:left;}
#outside_right{width:10px; float:right;}
#middle{background-color:#color of rnd_crnrs_foo.gif; float:left;}

Then

HTML:

<div id="mainWrapperDivWithBGImage">
  <div id="outside_left><img src="rnd_crnrs_left.gif" /></div>
  <div id="middle">
    <div id="another_div"><img src="foo.gif" /></div>
  <div id="outside_right><img src="rnd_crnrs_right.gif" /></div>
</div>

You may have to do position:relative; and such.

If you are using the background image for the rounded corners then I would rather increase the padding style of the main div to give enough room for the rounded corners of the background image to be visible.

Try increasing the padding of the main div style:

#mainWrapperDivWithBGImage 
{   
    background: url("myImageWithRoundedCorners.jpg") no-repeat scroll 0 0 transparent;   
    height: 248px;   
    margin: 0;   
    overflow: hidden;   
    padding: 10px 10px;   
    width: 996px; 
}

P.S: I assume the rounded corners have a radius of 10px.