js-网站广告图片漂浮

<div id="codefans_net" style="position:absolute">
<a href="#" target="_blank">
<img src="images/banner.png" width='400px' border="0">
</a>
</div>
<script> var x = 50,y = 60 var xin = true, yin = true var step = 1 var delay = 10 var obj=document.getElementById("codefans_net") function float() { var L=T=0var R= document.body.clientWidth-obj.offsetWidth var B = document.body.clientHeight-obj.offsetHeight obj.style.left = x + document.body.scrollLeft obj.style.top = y + document.body.scrollTop x = x + step*(xin?1:-1) if (x < L) { xin = true; x = L} if (x > R){ xin = false; x = R} y = y + step*(yin?1:-1) if (y < T) { yin = true; y = T } if (y > B) { yin = false; y = B } } var itl= setInterval("float()", delay) obj.onmouseover=function(){clearInterval(itl)} obj.onmouseout=function(){itl=setInterval("float()", delay)} </script>
//在写好的页面上，放这段代码，图片怎么都不动。
//后面改成jquery，好使了。
//宣传图片漂浮    var x = 50,y = 60;var xin = true, yin = true;var step = 1;var delay = 10;var obj=$('#codefans_net');function float() {var L=T=0var R= $(window).width()-obj.outerWidth();var B = $(window).height()-obj.outerHeight();obj.css('left',x+$('body').scrollLeft());obj.css('top',y+$('body').scrollTop());x = x + step*(xin?1:-1)if (x < L){xin = true;x = L}if (x > R){xin = false;x = R}y = y + step*(yin?1:-1)if (y < T) {yin = true;y = T;}if (y > B){yin = false;y = B}}var itl= setInterval("float()", delay)obj.mouseover(function(){clearInterval(itl);});obj.mouseout(function(){itl=setInterval("float()", delay);});//----------漂浮完