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="/u/info_img/2009-06/18/9597_logo.gif" alt="建站学院1号站"> <img src="/u/info_img/2009-06/18/9597_logo.gif" alt="建站学院2号站"> <img src="/u/info_img/2009-06/18/9597_logo.gif" alt="建站学院3号站"> <div style="visibility:hidden;border:0px solid #000000;background-color:#333333;font-size:12px;color:#6699cc;position:absolute;" id=altlayer></div> <script> 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.hint event.srcElement.alt=""; } else altlayer.style.visibility='hidden';} </script>