建一表格，每行都套一个iframe，它的src指向一报表，显示的时候各报表的距离不一样，怎样解决，在线等待

<table height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0>
<tr >
  <td bordercolor="#FFFFFF" valign="top">
                     
                    <iframe  id="posiInfoFrame" name="posiInfoFrame" width="100%" marginHeight="0" hspace="0" marginWidth="0" vspace="0" scrolling="no" FRAMEBORDER="0" onload="dyniframesize1(this)" src="showPosiInfo?positionId=<c:out value='${posiList.positionId}'/>"></iframe>
                     
                  </td>
  </tr>
<tr >
  <td bordercolor="#FFFFFF" valign="top">
                   
                    <iframe  id="posiDutyFrame" name="posiDutyFrame" width="100%" FRAMEBORDER="0" marginHeight="0" hspace="0" marginWidth="0" vspace="0" scrolling="no" onload="dyniframesize1(this)" src="posiDuty/showPositionDutyList?positionId=<c:out value='${posiList.positionId}'/>"></iframe>
                   
                  </td>
  </tr>
<tr >
  <td bordercolor="#FFFFFF" valign="top">
                    
                    <iframe  id="posiDutyDescFrame" name="posiDutyDescFrame" width="100%" FRAMEBORDER="0" marginHeight="0" hspace="0" marginWidth="0" vspace="0" scrolling="no" onload="dyniframesize1(this)" src="posiDuty/showPositionDutyDetailList?positionId=<c:out value='${posiList.positionId}'/>"></iframe>
                   
                  </td>
  </tr>