function cat(a) {  
  $("#butonlar").hide(); 
msg1 = '';
msg = '';
  var cat =  $("#cat"+a).val();
  if(a == '1') {
	  $("#cat2div").hide(); 
	  $("#cat3div").hide(); 
	  $("#cat4div").hide(); 
         
  }
        $.ajax({
            type: "GET",
            data: "cat=" + cat	+ '&tabindex=' + a,
            url: "https://firmabak.com/com/common/js/firmaselect-cat.php?class=",
            success: function(msg){    
                   msg1 = msg;
                  
                        $("#cat"+a+"div").html(msg).show();   
                     
            }
        });
          
 }