<div id="bagie">
<script src='http://code.jquery.com/jquery-1.6.2.min.js' type='text/javascript'></script>
<script>
$(document).ready(function(){
            $("#bgcolor1").click(function(){
                        $("body").css({"background":"url(图片网址1)"});
            });
});
$(document).ready(function(){
            $("#bgcolor2").click(function(){
                        $("body").css({"background":"url(图片网址2)"});
            });
});
$(document).ready(function(){
            $("#bgcolor3").click(function(){
                        $("body").css({"background":"url(图片网址3)"});
            });
});

</script>
<center>Choose your own background ❤</center>
<center><a href="javascript:void(O)" id='bgcolor1' title=""><img src=" 图片网址1" /></a>
<a href="javascript:void(O)" id='bgcolor2' title=" "><img src="图片网址2" /></a></center>
<center><a href="javascript:void(O)" id='bgcolor3' title=" "><img src="图片网址3" /></a></center>
</div>
<br>