i can't get data from text box clone

i can't get data from text box clone

hay all ,I'm beginner in here and also beginner for using jquery .so i have much problem to use  jquery ^_^ 

and for the first time i have problem with clone form or clone text box 

and this is i get the value from my form, 

$(document).ready(function(){
var companyName = $("input[id='companyName[]']").attr('value');

$.ajax({
type: "POST",
      url: "saveWork.php",
                              data: "companyName[]="+ companyName + counter  +  "&memberId=" + member ,
                              $('#saveChangeWork').hide('fast'); $("#loadingWorkProccess").fadeIn(500).html('<img src="loading/ajax-loader-facebook-black.gif" align="absmiddle"/> Proccessing...</span>');
                                                                  cache: false,
success: function(html){
$('.successWorkEdit').fadeIn(3000).fadeOut(800);
$('#formEditWork').hide('fast');
$('#workInfoPreview').show('slow');
$('#workInfoPreview').load('loadWork.php');
$('#workClickEdit').show('slow');
$("#loadingWorkProccess").hide('fast');
$('#saveChangeWork').show('slow');
}
});

 
return false;
});
}); 

where i miss ?? i can't send a value clone 


nb: im so sorry ,because im newbe in here ^_^