SQL syntax validation in jQuery

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Ajax

jQuery

validation

Hi:
Friends of my code PHP part is working properly, but the jQuery only message is printed No
Thanks for the tips here.

function signin(){
	var user=document.getElementById('txtuser').value;
	var pass=document.getElementById('txtpass').value;
	$.post('vorod.php',{txtuser:user,txtpass:pass},
	function(data)
	{

	if(data['success'])
	alert ("ok");
	else alert ("noo");
		//location.replace('/h_free_software/index.php');
	
	});
	}

php code:

<?php
$json_ret = array('success'=>false);
include ("send.php");
$obj=new classconnect();
$obj->funcconnect();
$_user=$_POST[txtuser];
$_pass=$_POST[txtpass];
$querylog=mysql_query("SELECT * FROM  _tbvorod WHERE `_use_r`='{$_user}' AND _pas_s='{$_pass}'");
if($querylog){
   $_SESSION[admin]=$_user;
   $json_ret['success'] = true;
	}
	
	


?>

Another way to tell if I am grateful to you