实现页面加载中。。

<scripttype="text/javascript">
window.onload=function(){
vara=document.getElementById("loading");
a.parentNode.removeChild(a);
}
document.write('<divid="loading"style="background:#CC4444;color:#FFF;width:75px;line-height:20px;position:absolute;padding:03px">正在读取...</div>');
</script>
<bodystyle="margin:0px;padding:0px;font-size:12px">
<iframesrc="http://www.blueidea.com"width="500px"height="500px"></iframe>
</body>