[yasas177]

Try this css also,

The markup
<div id="background">
<img src="img.jpg" class="stretch" alt="" />
</div>

The css
#background {

width: 100%;
height: 100%;
position: absolute;
left: 0px;
top: 0px;
z-index: 0;

}

.stretch
{
width:100%;
height:100%;

}