Ajax loader div in zend framework

KJA

through my application I use common Ajax loader Div, i show it always when i make an ajax request

submitHandler: function(form) { 

                $('#loader').show();
                $(form).ajaxSubmit({
                    type: 'POST',
                    url: "/exampleactions/example",
                    data:{
                    },
                    success: function(response_data){
                        $('#loader').hide();

where is the best place to put this div to use it every where ?

shall i put it layout.php ?