$(document).ready(function() { 


    var options = { 
        target:        '#newsletter',   // target element(s) to be updated with server response 
        replacetarget: true,        
        beforeSubmit:  validate  // pre-submit callback k
 
        // other available options: 
        //url:       url         // override for form's 'action' attribute 
        //type:      type        // 'get' or 'post', override for form's 'method' attribute 
        //dataType:  null        // 'xml', 'script', or 'json' (expected server response type) 
        //clearForm: true        // clear all form fields after successful submit 
        //resetForm: true        // reset the form after successful submit 
 
        // $.ajax options can be used here too, for example: 
        //timeout:   3000 
    }; 
   
    // bind to the form's submit event 
    

  $('#newsletter').submit(function() { 

        // inside event callbacks 'this' is the DOM element so we first 
        // wrap it in a jQuery object and then invoke ajaxSubmit 
        $(this).ajaxSubmit(options); 
 
        // !!! Important !!! 
        // always return false to prevent standard browser submit and page navigation 
        return false; 

   });
}); 


// pre-submit callback 
function validate(formData, jqForm, options) { 
  for (var i=0; i < formData.length; i++) { 
        if (!formData[i].value) { 
            alert('Please enter a valid email address'); 
            return false; 
        } 
    } 

}