处理jsp显示文字过长问题

<tr>
    <td height="60px;" width="20%" align="right" valign="top">
      <font style="font-weight: bold;">标题：</font>
     </td>
    <td height="60px;" width="80%" align="left" valign="top">
        <a id="span_content" href="#" style="color: white;" onmousemove="showdiv('span_div','',event)" onmouseover="showdiv('span_div','',event)" onmouseout="showdiv('span_div','none',event)">
    <c:if test="${fn:length(schedule.content eq null?'无':schedule.content)>70}">${fn:substring(schedule.content eq null?'无':schedule.content,0,70)}...</c:if></a>
        <span id="span_content_span"><c:if test="${fn:length(schedule.content eq null?'无':schedule.content)<=70}">
        ${schedule.content null?'无':schedule.content}</c:if></span>
    </td>
     <div id="span_div" class="showDiv" style="display:none">
            ${schedule.content eq null?'无':schedule.content}
    </div>    
</tr>
<script type="text/javascript">
      function showdiv1(objstr,str,ev) {//根据鼠标位置显示对象,参数ev为event 
                    var ObjX,ObjY;//对象的位置(x,y) 
                    var mouseX=10;//对象的(x)水平位置距离鼠标的宽度 
                    var mouseY=-2;//对象的(y)垂直位置距离鼠标的高度 
                    var obj = document.getElementById(objstr); 
                    obj.style.display=str;//显示或隐藏对象 
                    obj.style.left ='200px'; 
                    obj.style.top ='110px'; 
                }
</script>