当表格内容超过预设的长宽后，自动产生滚动条

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>