CSS Hack

 * html div.tableContainer { /* IE only hack */
     width:95%;
     border:1px solid #ccc;
     height: 285px;
     overflow-x:hidden;
     overflow-y: auto;
  }


* html div.tableContainer table thead tr td,
* html div.tableContainer table thead tr th{
 /* IE Only hacks */
   position:relative;
      top:expression(dojo.html.getFirstAncestorByTag(this,'table').parentNode.scrollTop);
  }

html>body tbody.scrollContent {
    height: 262px;
   overflow-x:hidden;
   overflow-y: auto;
  }

 tbody.scrollContent td, tbody.scrollContent tr td {
     background: #FFF;
     padding: 2px;
  }

  tbody.scrollContent tr.alternateRow td {
     background: #e3edfa;
     padding: 2px;
  }


<div class="tableContainer">
<table dojoType="SortableTable" widgetId="testTable" headClass="fixedHeader" tbodyClass="scrollContent" ...>
   <thead>

It is excerpted from dojo sortableTable test file, since IE doesn't support overflow(scrollbar) on tbody, it plays a trick by wrapping a scrollable div around table, and relatively position the thead to simulate the effect.

* html only visible to IE, and child selector html>body not visible to IE. Also note that the descendant selector is applied above.