问如何在没有<select>标记的情况下获得<form>的值

EN

<div id="box1">
   <input name="fname" type="text" placeholder="name">
</div>

<div id="box2">
   <select id="food" name="food">
       <option value="meat" name="nmeat">   meat  </option>
       <option value="fruit" name="nfruit"> fruit </option>
    </select>
</div>

// ^ Above code is in a JQuery Conditional Statement
// When user select meat, <select id="meat"> will display else fruit


<div id="box3">
   <!--MEAT-->
   <select id="meat" name="topic">
       <option value="hotdog" name="nhotdog">   hotdog     </option>
       <option value="sausage" name="nsausage"> sausage    </option>
    </select>

    <!--FRUIT-->
    <select id="fruit" name="topic">
       <option value="apple" name="napple">   apple   </option>
       <option value="grapes" name="ngrapes"> grapes  </option>
    </select>

 </div>

<div id="box4">
   <textarea name="desc" rows="5" class="span11" placeholder="Description"></textarea>
   <button name="submit" class="btn btn-large btn-block btn-primary" type="button">Submit</button>

</div>

<?php
    if ( isset( $_POST['submit'] ) ) {
        $name = $_POST["fname"];   //box1
        $gender =$_POST["gender"]; //box2
        $topic =$_POST["topic"];   //box3
        $desc =$_POST["desc"];     //box4
        //echo $msg;
        $sql = "insert into z_form (name) values ('".$msg."')";
        mysql_query( $sql );
    } else {
        echo "error";
    }
 ?>