http://www.w3schools.com/cssref/tryit.asp?filename=trycss_zindex
<!DOCTYPE html>
<html>
<head>
<style>
img
{
position:absolute;
left:0px;
top:0px;
z-index:-1;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<img src="w3css.gif" width="100" height="140" />
<p>Because the image has a z-index of -1, it will be placed behind the text.</p>
</body>
</html>
-absolute / relative
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