菜鸟，急，急急，急急急，请老程序人给看看，以下的ＪＳ哪错了。好了立即给分。
<script language= "javascript ">
function showinfo()
{
//sp.innerHTML =this.scrollTop;
document.getElementById( "sp ").innerHTML =document.getElementById( "div1 ").scrollTop;
document.getElementById( "sp1 ").innerHTML= "scrollTop: "+document.getElementById( "div1 ").scrollTop;
document.getElementById( "sp2 ").innerHTML= "clientHeight: "+document.getElementById( "div1 ").clientHeight;
document.getElementById( "sp3 ").innerHTML= "scrollHeight: "+document.getElementById( "div1 ").scrollHeight;
}
</script>
<div id= "div1 " style= "width: 400px; height: 300px; background: green;overflow: scroll; " onscroll= "showinfo(); ">
<div style= "width: 300px; height: 600px; background: gray; "> </div>
</div>
<br> <span id= "sp "/>
<br> <span id= "sp1 "/>
<br> <span id= "sp2 "/>
<br> <span id= "sp3 "/>

为什么只有> <span id= "sp "/> 显示数据，其它的都不显示呢？？在线。

[解决办法]
<br> <span id= "sp "> </span>
<br> <span id= "sp1 "> </span>
<br> <span id= "sp2 "> </span>
<br> <span id= "sp3 "> </span>
写成这样
[解决办法]
<br> <span id= "sp "> </span>
<br> <span id= "sp1 "> </span>
<br> <span id= "sp2 "> </span>
<br> <span id= "sp3 "> </span>