document.write('<table width="840" border="0" cellpadding="0" cellspacing="0" bgcolor="#F2F8FF" style="margin-top:10px;">');
document.write('  <tr>');
document.write('    <td width="51%" style="padding:0px;border-right:0px solid #cecece;">');

        document.write('<form action="userlogin.do" method="post" target="_self" onsubmit="return checklogin(this)" style="margin:0px;">');
        document.write('  <table border="0" width="95%" id="table3" cellspacing="0" cellpadding="0" align="left">');
        document.write('    <tr>');
        document.write('     <td><div align="center">用户名：');
        document.write('       <input name="username" type="text" id="username" style="border:1px solid #cecece;" size="6" />');
        document.write('        密码：');
        document.write('        <input name="password" type="password" id="password" style="border:1px solid #cecece;" size="6" />');
        document.write('       &nbsp;&nbsp;&nbsp; </span>');
        document.write('              <input type="submit" name="Submit2" value="登陆" style="border:1px solid #cecece; font-family:serif; font-size:9pt" />');
        document.write('             &nbsp;&nbsp;&nbsp;&nbsp;<input type="button" name="Submit3" value="注册" style="border:1px solid #cecece; font-family:宋体; font-size:9pt" onClick="javascript:location.href=\'reg.jsp\'" />');
        document.write('              <input type="hidden" name="usertype" value="bbs" />');
        document.write('              <input type="hidden" name="directUrl" value="'+location.href+'" />');
        document.write('      </div></td>');
        document.write('    </tr>');
        document.write('  </table>');
        document.write('</form>');
      
document.write('</td>');
document.write('</tr>');
document.write('</table>');
function checklogin(obj){
	if(obj.username.value==""){
		alert("用户名不能为空!");
		obj.username.focus();
		return false;
	}
	if(obj.password.value==""){
		alert("密码不能为空!");
		obj.password.focus();
		return false;
	}
}