Hi i've got a problem evaluating json. My goal is to insert json member value to a function variable, take a look at this

function func_load_session(svar){

var id = '';

$.getJSON('data/session.php?load='+svar, function(json){

  eval('id = json.'+svar);

});

return id;

}

this code i load session from php file that i've store beforehand. i store that session variable using dynamic var.

<?php
/*
* format ?var=[nama_var]&val=[nilai_nama_var]
*/ 

$var = $_GET['var'];
$val = $_GET['val'];
$load = $_GET['load'];

session_start();

if($var){
  $_SESSION["$var"] = $val;
  echo "Store SESSION[\"$var\"] = '".$_SESSION["$var"]."'";
}else if($load){
  echo $_SESSION["$load"];  
}
?>

using firebug, i get expected response but i also received error

uncaught exception: Syntax error, unrecognized expression: )

pointing at this

eval('id = json.'+svar);

i wonder how to solve this