根据选中的php mysql复选框插入文本字段内容

Hey Fellow Programmers,

I have a slight problem and I cant find the right answer online.

Basically what I need to do is, a user inserts content into a text box and then selects a check box. Whichever check box is selected is what table the text box content is supposed to insert into. **Both check boxes can be selected so the user can upload to two diff tables, before you ask no I cannot just upload to a diff row it has to be a completely diff table.

Let me know if I am not clear, and thanks in advance

HTML CODE:
<body class="login">
   <div class="wrapper">
      <h1><a href="index.php"><img src="img/logo-big.png" alt="" class='retina-ready' width="59" height="49">FLAT</a></h1>
      <div class="login-body">
         <form action="db_pre_panel.php" name="login" class='form-validate' id="test" method="post">
            <div class="control-group">
               <div class="email controls">
                  <h3>TEST</h3>
                  <input type="text" name="content" maxlength="500" placeholder="Content" />
               </div>
            </div>
            <div class="control-group">
               <input type="checkbox" name="Ck_1" /> <label>Ck_1</label>//If selected then INSERT content into tbl_connect
               <input type="checkbox" name="Ck_2" /> <label>Ck_2</label>//If selected then INSERT content into tbl_share
            </div>
            <div class="submit">
               <input type="submit" value="Simplicity" />
            </div>

PHP CODE:
<?php
    //Define Content, Post & Share
    $content=$_POST['content'];
    $post=$_POST['ck_1'];
    $share=$_POST['ck_2'];

    //Insert into the db    
    $sql_post="INSERT INTO $tbl_connect (wall) VALUES ('$connect', '$post')";
    $sql_share="INSERT INTO $tbl_share (wall) VALUES ('$connect', '$share')";

    //Make sure it insert into db   
    $result_post = mysql_query($sql_post);
    $result_share = mysql_query($sql_share);

    if($result_post){
       header("location:alert.php");
    }else{
       header("location:error.html");
    }

    if($result_share){
       header("location:http://www.google.com");
    }else{
       header("location:error.html");
    }
?>

Just keep it simple:

   //Define Content, Post & Share
   $content = $_POST['content'];  // you should sanitize this to prevent SQL injection

   if ( !empty($_POST['ck_1']) ) {
      $sql_post = "INSERT INTO `tbl_connect` (wall) VALUES ('$connect')";  // if you have more than one value, then you need to specify more than one column...
   }

   if ( !empty($_POST['ck_2']) ) {
      $sql_share = "INSERT INTO `tbl_share` (wall) VALUES ('$connect')";
   }