address field. js and style is broken

app/assets/javascripts/inc/ploy_input_field.js

@@ -0,0 +1,26 @@
+        function checkMultipleInput() {
+            $(".multipleInput").each(function() {
+                $(this).children('.controls').length==1 ? $(this).addClass("plural") : $(this).removeClass("plural")
+            });
+        }
+        function removeInput(){
+            $(".removeInput").click(function (){
+                $(this).parents(".controls").remove();
+                checkMultipleInput();
+                return false;
+            });
+        }
+        $(document).ready(function(){
+            var $modalNumber = 0;
+            checkMultipleInput();
+            removeInput();
+            $(".addinput").click(function (){
+                $modalNumber+=1;
+                var $CloneTarget = $(this).parents(".controls").prev(".multipleInput").children('.controls:last');
+                $(this).parents(".controls").prev(".multipleInput").append($CloneTarget.clone());
+                $(this).parents(".controls").prev(".multipleInput").children('.controls:last input').val("");
+                removeInput();
+                checkMultipleInput();
+                return false;
+            })
+        });