hello every body

i have a form and i want to post it's fields to external page

like

1. <script src="http://code.jquery.com/jquery-latest.js"></script>
2.   <script type="text/javascript">
   $(document).ready(function(){
   
3. $("input:submit").click(function(){
   $.post("http://xxxxxx.net/login.php",{email:$("#email").val()},function(data){
   $("#contents").html(data);
   });
   return false;
   });
   });
   </script> 
   
   
   
   
   
   
   
this code not working and return no thing

but when i chang the url to local page it working fine 

2. <script src="http://code.jquery.com/jquery-latest.js"></script>
3.   <script type="text/javascript">
   $(document).ready(function(){
   
4. $("input:submit").click(function(){
   $.post("login.php",{email:$("#email").val()},function(data){
   $("#contents").html(data);
   });
   return false;
   });
   });
   </script> 
   
   
   
   
   
   
   
any help???