<style>
#slider img{
visibility:hidden;
background-color:#000;
background-image:url(http://uploads.ru/i/0/S/c/0ScZL.gif);
background-position:center center;
background-repeat:no-repeat;
}
</style>
<script type="text/javascript">
function LoImg(a) {
a.visibility='visible';
a.backgroundСolor='transparent';
a.backgroundImage='none';
}
</script>
<div id="slider">
<img src="1" onload="LoImg(this)">
<img src="2" onload="LoImg(this)">
<img src="3" onload="LoImg(this)">
</div>