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.knowsky.com/images/logo.gif" alt="网页教学网1号站">
<img src="http://www.knowsky.com/images/logo.gif" alt="网页教学网2号站">
<img src="http://www.knowsky.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>
<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>
