php之表单提交请指教，急，急

Question

$conn=@mysql_connect("localhost","root"); 
        $sql=@mysql_select_db("Jocky",$conn);
        $query="select * from user1 where name='$name'";        
        $result=mysql_query($query);
        if(!$result)
        {
         echo "sql语句错误！";
        }
        else
        {
            $num_rows=mysql_num_rows($result);
         if($num_rows>0)
         { 
         echo"<br><center><font color=blue>对不起，已经有相同的用户名！请</font><a href=zcyh.php>返回</a>.</center><br>";
         include("include/common.inc"); 
include("include/footer.inc"); 
         }
         else
         {
         $conn=@mysql_connect("localhost","root"); 
             $sql=@mysql_select_db("Jocky",$conn); 
             $sqldo="insert into user1 values ('".$name."')"; 
               @mysql_query($sqldo,$conn); 
             echo "你好，".$name."！请点"."<a href=check.php>下一步</a>"."填写注册信息";
                 @mysql_close($conn);
              include("include/common.inc"); 
include("include/footer.inc");
exit();
         }
这是连接数据库的部分，其他的自己写。多看PHP手册，MYAQL手册。