jQuery Grid Plugin - jqGrid

Hi,tony:

   can write code like this ?

 jQuery("#taskList").jqGrid({
    url:'192.168.1.88:13310/stat/tasks',
       datatype:'xml',

   ..............

the url is   cross-domain.    jqgrid can't read the data.

and I  add the following code as  a php file "tasklist.php" :

<?
$content = @file_get_contents('http://192.168.1.88:13310/stat.....s&#39;);
if (stristr($_SERVER["HTTP_ACCEPT"],"application/xhtml+xml")) {
header("Content-type: application/xhtml+xml"); } else {
header("Content-type: text/xml");
} ;
echo $content;
?>

and set url to "tasklist.php" ,the grid can read the data.

why this two different ways can lead to two different results?