<head>
<base href="http://www.code.huypv.net/images/" target="_blank" /> <!-- don't forget put a slash at the end of URL -->
</head>
<a href="dance.html">Dance</a> --> link to http://www.code.huypv.net/images/dance.html
<a href="/dance.html">Dance</a> --> link to http://www.code.huypv.net/dance.html
<div style="background:url('bg.png') no-repeat">Affected</div> --> load http://www.code.huypv.net/images/bg.png