用虚线做的表格[网页特效]

不知道你见过没有，这个特效是把网页中图片的默认alt的提示去掉

<img src="http://www.vevb.com/images/logo.gif" alt="网页教学网1号站"><img src="http://www.vevb.com/images/logo.gif" alt="网页教学网2号站"><img src="http://www.vevb.com/images/logo.gif" alt="网页教学网3号站"><div style="visibility:hidden;border:0px solid #000000;background-color:#333333;font-size:12px;color:#6699cc;position:absolute;" id=altlayer></div><scr<a href="http://ip.vevb.com/">ip</a>t>document.body.onmousemove=quickalt;function quickalt() {if (event.srcElement.hint)event.srcElement.alt=event.srcElement.hint;if(event.srcElement.alt && event.srcElement.alt!='') {event.srcElement.hint=event.srcElement.alt;altlayer.style.visibility='visible';altlayer.style.left=event.x-1;altlayer.style.top=event.y+16;altlayer.innerHTML=event.srcElement.hintevent.srcElement.alt="";}else altlayer.style.visibility='hidden';}</script>