diff --git a/main.js b/main.js
index a306b69d23..ae41f8f672 100644
--- a/main.js
+++ b/main.js
@@ -170,100 +170,103 @@ function add_custom_spinners() {
     $('input[type="number"]').each(function() {
         var input = $(this);
         
-        var isInt = true;
-        if (input.prop('step') == '') {
-            isInt = true;
-        } else {
-            if (input.prop('step').indexOf('.') == -1) {
+        // only add new spinner if one doesn't already exist
+        if (!input.next().hasClass('spinner')) {
+            var isInt = true;
+            if (input.prop('step') == '') {
                 isInt = true;
             } else {
-                isInt = false;
+                if (input.prop('step').indexOf('.') == -1) {
+                    isInt = true;
+                } else {
+                    isInt = false;
+                }
             }
+            
+            // make space for spinner
+            input.width(input.width() - 16);
+            
+            // add spinner
+            input.after(spinner_element);
+            
+            // get spinner refference
+            var spinner = input.next();
+            
+            // bind UI hooks to spinner
+            $('.up', spinner).click(function() {
+                up();
+            });
+            
+            $('.up', spinner).mousedown(function() {            
+                GUI.timeout_add('spinner', function() {
+                    GUI.interval_add('spinner', function() {
+                        up();
+                    }, 100, true);
+                }, 250);
+            });
+            
+            $('.up', spinner).mouseup(function() {
+                GUI.timeout_remove('spinner');
+                GUI.interval_remove('spinner');
+            });
+            
+            $('.up', spinner).mouseleave(function() {            
+                GUI.timeout_remove('spinner');
+                GUI.interval_remove('spinner');
+            });
+            
+            
+            $('.down', spinner).click(function() {
+                down();
+            });
+            
+            $('.down', spinner).mousedown(function() {            
+                GUI.timeout_add('spinner', function() {
+                    GUI.interval_add('spinner', function() {
+                        down();
+                    }, 100, true);
+                }, 250);
+            });
+            
+            $('.down', spinner).mouseup(function() {
+                GUI.timeout_remove('spinner');
+                GUI.interval_remove('spinner');
+            });
+            
+            $('.down', spinner).mouseleave(function() {
+                GUI.timeout_remove('spinner');
+                GUI.interval_remove('spinner');
+            });
+            
+            var up = function() {
+                if (isInt) {
+                    var current_value = parseInt(input.val());
+                    input.val(current_value + 1);
+                } else {
+                    var current_value = parseFloat(input.val());
+                    var step = parseFloat(input.prop('step'));
+                    var step_decimals = input.prop('step').length - 2;
+                    
+                    input.val((current_value + step).toFixed(step_decimals));
+                }
+                
+                input.change();
+            };
+            
+            var down = function() {
+                if (isInt) {
+                    var current_value = parseInt(input.val());
+                    input.val(current_value - 1);
+                } else {
+                    var current_value = parseFloat(input.val());
+                    var step = parseFloat(input.prop('step'));
+                    var step_decimals = input.prop('step').length - 2;
+                    
+                    input.val((current_value - step).toFixed(step_decimals));
+                }
+                
+                input.change();
+            };
         }
-        
-        // make space for spinner
-        input.width(input.width() - 16);
-        
-        // add spinner
-        input.after(spinner_element);
-        
-        // get spinner refference
-        var spinner = input.next();
-        
-        // bind UI hooks to spinner
-        $('.up', spinner).click(function() {
-            up();
-        });
-        
-        $('.up', spinner).mousedown(function() {            
-            GUI.timeout_add('spinner', function() {
-                GUI.interval_add('spinner', function() {
-                    up();
-                }, 100, true);
-            }, 250);
-        });
-        
-        $('.up', spinner).mouseup(function() {
-            GUI.timeout_remove('spinner');
-            GUI.interval_remove('spinner');
-        });
-        
-        $('.up', spinner).mouseleave(function() {            
-            GUI.timeout_remove('spinner');
-            GUI.interval_remove('spinner');
-        });
-        
-        
-        $('.down', spinner).click(function() {
-            down();
-        });
-        
-        $('.down', spinner).mousedown(function() {            
-            GUI.timeout_add('spinner', function() {
-                GUI.interval_add('spinner', function() {
-                    down();
-                }, 100, true);
-            }, 250);
-        });
-        
-        $('.down', spinner).mouseup(function() {
-            GUI.timeout_remove('spinner');
-            GUI.interval_remove('spinner');
-        });
-        
-        $('.down', spinner).mouseleave(function() {
-            GUI.timeout_remove('spinner');
-            GUI.interval_remove('spinner');
-        });
-        
-        var up = function() {
-            if (isInt) {
-                var current_value = parseInt(input.val());
-                input.val(current_value + 1);
-            } else {
-                var current_value = parseFloat(input.val());
-                var step = parseFloat(input.prop('step'));
-                var step_decimals = input.prop('step').length - 2;
-                
-                input.val((current_value + step).toFixed(step_decimals));
-            }
-            
-            input.change();
-        };
-        
-        var down = function() {
-            if (isInt) {
-                var current_value = parseInt(input.val());
-                input.val(current_value - 1);
-            } else {
-                var current_value = parseFloat(input.val());
-                var step = parseFloat(input.prop('step'));
-                var step_decimals = input.prop('step').length - 2;
-                
-                input.val((current_value - step).toFixed(step_decimals));
-            }
-            
-            input.change();
-        };
     });
 }
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