str='<table width="200" border="0" cellpadding="0" cellspacing="0" background="images/fubg.gif">';

str=str+' <tr> ';
     str=str+'<td height="28" colspan="3" background="images/bg40_1.gif">&nbsp;&nbsp;&nbsp;<span class="3dt">用户登录</span></td>';
      str=str+'</tr>';					
					
			str=str+'<tr align="center" id="hdlst" style="display:"> ';
                    str=str+'<td height="22" colspan="3" id="shdls"></td>';
                  str=str+'</tr>';
					str=str+'<form name="login" method="post" action="bbs/login.asp?action=chk" target="_top" onSubmit="return chkloginput()">';
                   str=str+' <tr> ';
                      str=str+'<td width="60" height="25" align="right">用户名：</td>';
                      str=str+'<td width="140" colspan="2"><input name="username" type="text" style="width:110px;height:18px" maxlength="30"></td>';
                    str=str+'</tr>';
                    str=str+'<tr> ';
                      str=str+'<td height="25" align="right">密　码：</td>';
                      str=str+'<td colspan="2"><input name="password" type="password" style="width:110px;height:18px" maxlength="20"></td>';
                    str=str+'</tr>';
					str=str+'<input name="formdir" type="hidden" value="inloginf">';
                    str=str+'<tr align="center"> ';
                      str=str+'<td height="25" colspan="3">&nbsp;&nbsp;&nbsp;&nbsp;<input name="Login" type="submit" value="登 录" class="input">&nbsp;&nbsp;<input name="Reset" type="reset" value="清 除" class="input"></td>';
                    str=str+'</tr>';
					str=str+'</form>';
                    str=str+'<tr align="center" valign="bottom"> ';
                      str=str+'<td height="25" colspan="3"><a href="bbs/reg.asp" target="_blank">新用户注册</a>&nbsp;&nbsp;&nbsp;<a href="bbs/lostpass.asp" target="_blank">忘记密码?</a>&nbsp;</td>';
                    str=str+'</tr>';
str=str+'<IFRAME id="frameChkdl" name="frameChkdl" src="about:blank" width="0" scrolling="no" height="0"></IFRAME>';
str=str+'<script language="javascript">';
str=str+'function chkloginput(){';
str=str+'if (login.username.value==""){';
str=str+'alert("用户名？");';
str=str+'login.username.focus();';
str=str+'return false;}';
str=str+'if (login.password.value==""){';
str=str+'alert("密码？");';
str=str+'login.password.focus();';
str=str+'return false;}';
str=str+'document.login.target="frameChkdl";';
str=str+'hdlst.style.display="";';
str=str+'shdls.innerHTML="<font color=red>正在检验登录信息，请稍后...</font>";';
str=str+'}';
str=str+'</script>';
					
					str=str+'<tr> ';
                      str=str+'<td colspan="3"><img src="images/fux.gif" border="0"></td>';
                   str=str+' </tr>';
                  str=str+'</table>';
document.write(str);