You can see the way I have preloaded the image with javascript
<html>
<head>
<script language = "JavaScript">
function preloader()
{
loadingImage = new Image();
loadingImage.src = "../images/ra_loading.gif";
}
</script>
</head>
<body onLoad="javascript:preloader()">
<!--call for Javascript to preload the image-->
<img src="../images/ra_loading.gif" alt="Aguarde..processando seu pagamento..." title="Aguarde..processando seu pagamento..." />
</body>
</html>