***********奇怪，我的树形部分的滚动条出不来？**************50分******

全部语句：<html>
<head>
<title>
MenuTree
</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<STYLE>
BODY
{
    BACKGROUND-COLOR: "#F1F1F1";
}
table,tbody,tr,td,img {CURSOR: hand;}
.td1{
      BORDER-TOP:  1px solid #cccccc;
      BORDER-BOTTOM:  1px solid #666666;
     }
.clsMouseDown{
     BORDER-RIGHT:  1px solid ;
     BORDER-TOP:    1px solid ;
     BORDER-LEFT:   1px solid ;
     BORDER-BOTTOM: 1px solid ;
     Color:         #000000;
     BORDER-COLOR:  #000000   ;
     BACKGROUND-COLOR: #ffffff;
    }
.clsMouseOver{
     BORDER-RIGHT:  1px solid ;
     BORDER-TOP:    1px solid ;
     BORDER-LEFT:   1px solid ;
     BORDER-BOTTOM: 1px solid ;
     Color:         #ffffff;
     BORDER-COLOR:  #000000   ;
     BACKGROUND-COLOR: #CCCCCC;
    }
</style>
<script language="JavaScript" src="TypeTree.js"></script>
</head>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
<td align="center" bgcolor="#C0C0C5"> <font color="#ffffff" size="4"><b>&#65417;&#65420;&#65414;&#65399;&#65412;&#65407;&#65410;&#65404;</b></font>
    </td>
</table>
<nobr>
<div style="overflow:auto;width:100%; height:84%">
<script language="JavaScript">
var tv=new TreeView();
tv.add(0,100,"100","","http://tyee.8u8.com");
tv.add(100,200,"200","","http://tyee.8u8.com");
tv.add(100,201,"201","","http://tyee.8u8.com");
tv.add(100,202,"202","","http://tyee.8u8.com");
tv.add(100,203,"203","","http://tyee.8u8.com");tv.refresh();
</script>
</div>
</nobr>
</body>
</html>