[jQuery] how do it?

[Luciano]

I have a input = search and a form = form-search,
well i need create action keypress on input search i do this:

        $(document).ready(function() {
                $('input #search')
                        .keypress(function(){
                                $('#inf').fadeIn('normal');
                        })
        });

but no sucess,

so i try it:

        $(document).ready(function() {
                $('#search')
                        .keypress(function(){
                                $('#inf').fadeIn('normal');
                        })
        });

it`s ok but i want especify input first, i have two more objects with
this id, no inputs normal divs..

exist ?
$('input #search') or
$('input > #search') or
$('input search')
?

tks