如果要在js中控制滚动条显示的位置的话：
document.getElementById("out").scrollTop=document.getElementById("out").scrollHeight;
<style>
#out{
WIDTH:800px;
HEIGHT:300px;
POSITION:relative;
OVERFLOW-X:scroll;
OVERFLOW-Y:scroll;
SCROLLBAR-ARROW-COLOR:#48b4fc;
SCROLLBAR-BASE-COLOR:#D6E9FC;
}
</style>
<div id="out">
<table width="780" height="280">
<tr><td></td></tr>
......
</table>
</div>