<!DOCTYPE HTML>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script>
</head>
<body>
<div style="border:1px solid red">
<div id="a"></div>
</div>
<button onclick="a();">Click</a>
<script>
function a() {
$('#a').css('marginBottom', '-10px');
$('#a').css('paddingBottom', '10px');
}
</script>
<style>
#a {
width: 200px;
height: 90px;
background-image: url(http://javascript.ru/forum/images/smilies/smile.gif);
background-repeat: no-repeat;
background-position: center center;
/*border: 1px solid black;*/
}
</style>
</body>
</html>