调试易

jsp页面双击触发js事件，js取值报缺少对象，下面把代码贴出：
<script>
function getaboatinfo(id){;
var time = new Date(); 
var boatid = document.getElementById(id).value;
var url = "query/boatinfodwr.jsp?time="+time;
window.showModelessDialog(url,boatid,'dialogWidth:1000px;dialogHeight:500px;dialogLeft:200px;dialogTop:150px;center:yes;help:yes;resizable:yes;status:yes');
}
function enterinfo(bid){
var time = new Date(); 
var boatid = document.getElementById(bid).value;
var url = "query/bscoremx.jsp?time="+time;
window.showModelessDialog(url,boatid,'dialogWidth:1000px;dialogHeight:500px;dialogLeft:200px;dialogTop:150px;center:yes;help:yes;resizable:yes;status:yes');
}
</script>
HTML CODE:
<table width="99%" border="0" align="center"  cellpadding="3" cellspacing="1" class="table_style">
    <tr >
      <td width="15%" class="left_title_1"><span class="left-title">名称</span></td>
  <td width="15%" class="left_title_1"><span class="left-title">英文名称</span></td>
  <td width="15%" class="left_title_1"><span class="left-title">IMO</span></td>
  <td width="20%" class="left_title_1"><span class="left-title">船籍港</span></td>
      <td width="10%" class="left_title_1"><span class="left-title">风险等级</span></td>
  <td width="15%" class="left_title_1"><span class="left-title">管理</span></td>
    </tr>
    <%  
   for(int i=0;i<l.size();i++ ){ 
     Boatscore s = (Boatscore)l.get(i);
     Boatinfo binfo  = s.getBoatinfo();
     System.out.println("--boat_p_m--1011--"+binfo.getBoatid());
     %>
    <tr style="cursor:pointer;" >
      <td class="left_content_2" ><a href="#"  ondblclick="getaboatinfo('boatid+<%=i+1 %>')">
      <%=binfo.getBoatchinaname() %></a></td>
  <td class="left_content_2" ><%=binfo.getBoatenglishname() %></td>
      <td class="left_content_2"><%=binfo.getImonumber() %><input type="hidden" id="'boatid'+<%=i+1 %>" name="'boatid'+<%=i+1 %>" value="<%=binfo.getBoatid() %>"/></td>
  <td class="left_content_2"><%=binfo.getRegistport() %></td>
  <td class="left_content_red"><a href="#"  ondblclick="enterinfo('boatid+<%=i+1 %>')"><span class="left_content_red">
  <%=s.getScore() %></span></a></td>
  <td class="left_content_2"><input type="button" value="查看*****信息" onclick="getbadofboat('scoreid+<%=i+1 %>')"/></td>
    </tr>
<%

}
 %>
  </table>"var boatid = document.getElementById(bid).value;"js中的两个function都是这句报缺少对象，之前getaboatinfo(id)能正常运行。请高手指点....先谢过....