How can i overlay an 10x10px image on top of another image?

Question

Hi Guys,

I have a user avatar on my website. Simple image tag:

<img src="foo.jpg" class="userphoto" width="48" height="48" alt="">

Now, i want to float an image (Facebook Icon - 10x10px) over this image on the top left corner of the image.

This is to signify that the user is authenticated to Facebook.

How can i do this? CSS styling on the image tag, or will i have to have a seperate div with absolute positioning?

Doesn't need to be transparent or anything, just needs to be positioned exactly in the top-left corner.

Of course i cant just physically modify the image, as i need to determine whether to overlay the image dynamically based on the Facebook status. But i was hoping to dynamically add a css class.

Any ideas?

ANSWER:

Got it working with a combination of both answers. Used a div instead of another image.

HTML:

<div class="foo">
   <div class="fboverlay"></div>
   <a>
      <img src="foo.jpg" class="userphoto" width="48" height="48" alt="">
   </a>
</div>

CSS:

.foo
{
   position: absolute;
   top: 0;
   right: 0;
}

.fboverlay
{
    background-image: url('/image/facebook/logo.gif');
    position: absolute;
    z-index: 1;
    top: 10px;
    left: 10px;
    width: 10px;
    height: 10px;
}

Thanks for the help.

Answer 1

First you have to position it - either relative or absolute usually.

Secondly, you have to set a z-index if there are other positioned elements, though you may not necessarily need one.

Using top/left or bottom/right combinations layer the image over the other one.

This is advice without seeing any html/css. It will obviously differ depending on the situation.

#el-on-top { position:absolute; top:0; left:0; z-index:1; }

You may need to set position:relative so the AP'd element's top is relative to something, instead of say, the wrapper or the entire page.

Answer 2

I know I'm not using the exact dimensions you wanted, but here's a working example for you.

You would need the parent ".main_photo" div to be the dimensions of the main photo.

I updated the example with more appropriate class names.