And after submission an alert of "submitted successfully" should be displayed on top the screen..
If you want just a normal pop up button, you could do the following :
$('form').on('submit',function(){
alert('submitted successfully!');
});
The jquery form plugin offers an easy way to iterate over your form elements and put them in a query string. It might also be useful for whatever else you need to do with these values.
var queryString = $('#myFormId').formSerialize();
From http://malsup.com/jquery/form
Or using straight jquery:
var queryString = $('#myFormId').serialize();