TBODY显示滚动条 （让THEAD不滚动，TBODY滚动）

        <style>            body {                border: 0;                margin: 0;                overflow: hidden;            }            td { font-size:9pt; }            thead td {font-weight:bold;}            .title {                background-image: url('/images/grid_header.jpg'); height:26px;            }            span tbody tr td{                  border-top:1px solid #8B8989;                  height: 28px;         }          </style><tableid="contract_list"width="100%"cellspacing="0"cellpadding="4"border="2"rules="rows"frame="void" ><theadclass="title"><tr><tdwidth="15px"nowrap=""> </td><tdwidth="28%"nowrap=""> 名称</td><tdwidth="7%"nowrap="">版本号                   </td><tdwidth="11%"nowrap="">类型</td><tdwidth="11%"nowrap="">创建日期                   </td><tdwidth="11%"nowrap=""> 创建人</td><tdwidth="32%"nowrap=""> 说明</td></tr></thead></table><spanid="master"style="overflow-y: auto; overflow-x: hidden; height: 166px;"><tablecellspacing="0"><tbody><trstyle="height: 20px"><tdwidth="1"><imgvspace="0"hspace="3"align="middle"src="/images/button/doc.gif"></td><tdwidth="28%"valign="middle"nowrap=""><aonmousedown="showContractMenu('28', this,7,' zz');"href="javascript:openContract('28',' zz')">  zz </a></td><tdwidth="7%"nowrap=""align="left">3</td><tdwidth="11%"nowrap="">协议文档</td><tdwidth="11%"nowrap="">2011-12-01</td><tdwidth="11%"nowrap="">admin</td><tdwidth="32%"nowrap="">zz</td></tr><trstyle="height: 20px"><tdwidth="1"><tdwidth="28%"valign="middle"nowrap=""><tdwidth="7%"nowrap=""align="left">1</td><tdwidth="11%"nowrap=""> 协议文档</td><tdwidth="11%"nowrap="">2011-12-01</td><tdwidth="11%"nowrap="">admin</td><tdwidth="32%"nowrap="">temp+1</td></tr></tbody></table></span><script language="javascript">        function doResize(){               document.getElementById("master").style.height=document.body.offsetHeight-57;        }        var resizeTimer=null;        window.onresize = function(){               if(resizeTimer) clearTimeout(resizeTimer);               resizeTimer = setTimeout("doResize();",100);        };        doResize();</script>