要完成此效果把如下代碼加入到區(qū)域中
<script language=JavaScript>
var d=0
function JM_fade(ob){
if (d==0) {ob.filters.alpha.opacity+=1} else {ob.filters.alpha.opacity-=1}
if (ob.filters.alpha.opacity==100){d=1;} else if (ob.filters.alpha.opacity==0){d=0}
}
setInterval("JM_fade(u)",10)
</script>
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