<form id="sel_form" action="post.php" method="post"> 
  <p><input type="text" name="keys" id="keys" value="输入姓名或手机号码" onclick="this.value=''" /> 
  <input type="button" id="searchOption" value="搜索" /> <span id="msg_ser"></span></p> 
  <div id="sel"> 
  <select name="liOption[]" id='liOption' multiple='multiple' size='8'> 
  </select> 
  </div> 
  <input type="submit" value="提 交" /> 
</form> 

CREATE TABLE IF NOT EXISTS `t_mult` ( 
 `id` int(11) NOT NULL auto_increment, 
 `username` varchar(32) NOT NULL, 
 `phone` varchar(20) NOT NULL, 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8; 

<link rel="stylesheet" type="text/css" href="jquery.multiselect2side.css" /> 

<script type="text/javascript" src="js/jquery.js"></script> 
<script type="text/javascript" src="js/jquery.multiselect2side.js"></script> 
<link rel="stylesheet" type="text/css" href="jquery.multiselect2side.css" /> 

$("#liOption").multiselect2side({ 
  selectedPosition: 'right', 
  moveOptions: false, 
  labelsx: '待选区', 
  labeldx: '已选区' 
}); 

$("#searchOption").click(function(){ 
  var keys=$("#keys").val(); 
  $.ajax({ 
     type: "POST", 
     url: "action.php", 
     data: "title="+keys, 
     success: function(msg){ 
      if(msg==1){ 
        $("#msg_ser").show().html("没有记录！"); 
      }else{ 
        $("#liOptionms2side__sx").html(msg); 
        $("#msg_ser").html(""); 
      } 
     } 
  }); 
  $("#msg_ser").ajaxSend(function(event, request, settings){ 
    $(this).html(""); 
  }); 
}); 

$conn=mysql_connect("localhost","root",""); 
mysql_select_db("demo",$conn); 
mysql_query("SET names UTF8"); 

$keys=trim($_POST['title']); 
$keys=mysql_real_escape_string($keys,$conn); 
if(!empty($keys)){ 
   $sql="select * from t_mult where username like '%$keys%' or phone='$keys'"; 
}else{ 
   $sql="select * from t_mult"; 
} 
$query=mysql_query($sql); 
$count=mysql_num_rows($query); 
if($count>0){ 
  while($row=mysql_fetch_array($query)){ 
    $str.="<option value='".$row['id']."'>".$row['username']."-".$row['phone']."</option>"; 
  } 
  echo $str; 
}else{ 
  echo "1"; 
} 

$selID=$_POST['liOptionms2side__dx']; 
if(!empty($selID)){ 
  $str=implode(",",$selID); 
  echo $str; 
}else{ 
  echo "没有选择任何项目！"; 
}