success:function(data)

function SetTheAmount_man()
{   //Get
    var member_id = $('#mem_un_id').val();
    // alert(member_id);

     $.ajax({
        url:"<?php echo
        base_url();?>demo_insert.php",
        data: {member_id:member_id},
        type: "POST",
        success:function(data){
            //alert(data);
            //  alert(member_id);
            if (data == 'success')
            {
                alert("123");
            }
            else
            {
                alert("456");
            }
            //window.open('http://www.google.com');

        //alert(data);
     // $("#secheme_interest_value").html(data);
     }
  });

}

if(isset($_POST['member_id']))
{
    $mem_un_id=$_POST['member_id'];
    $sql_in= mysql_query("select mem_un_id,deleted from  phppos_customers where mem_un_id='".$_POST['member_id']."' and deleted='0'");
    //$row = mysql_affected_rows($sql_in);
    $row=mysql_fetch_array($sql_in);

    if($row['mem_un_id']!=''){
        echo "success";
    }else{
        echo "error";
    }

    //echo $row['mem_un_id'];
}