网站漂浮广告代码怎么写？

符合XHTML标准的漂浮广告代码(浮动广告代码) var x = y = 0; var xin = true, yin = true var step = 2; var delay = 1; var obj = document.getElementById("ad"); function floatAD(){ var L = 0; var T = (document.body.scrollTop?document.body.scrollTop:document.doc