<script type="text/
javascript" src="jquery-1.4.2.min.js"></script>
<script type="text/javascript">
$(function(){
$(".bd").append("<div id='mainbg'/>");
$("#mainbg").append("<img id='im' src='a82a2e72e7af59296db0d63e3d2ecc5e!n1200.jpg' />");
recover();
$(window).resize(function(e) {
recover();
});
});
function recover(){
var winw = $(window).width();
var winh = $(window).height();
$("#im").attr({width:winw, height:winh});
}
</script>
