Difficult to answer properly without knowing exactly what you want to achieve, z-index probably isn't what you actually need. For instance the following would work:
<div id="container">
<img src="img1.jpg" id="img1" />
<img src="img2.jpg" id="img2" />
</div>
#container {
position:relative;
}
#img2 {
position: absolute;
left: 50px;
top: 50px;
}
Also whether you use <img>
tags or background-images
depends on the semantic valueof the images, i.e. are they presentational or actualy content of the page?
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