[jQuery] Passing variables between two function

[Decagrog]

Hi all,
I've a newbie question about variable scope...essentially  i've two
anonimous function and i need to retrieve a variable
generated into first function and use it in the second one.

Here the basic code to get an idea of what i'm  trying...

  var pointX ;
  $(".nav_slider").mousemove(function(e){
        pointX = e.pageX ;
        // do some other stuff with  pointX ...
  });


  $(document).scroll(function () {
      var docH = $(window).height();
      var       docW = $(window).width();
      docWcenter =  docW / 2;

     //here i need again pointX ...
     $("#point").css( 'position',
'relative' ).animate({ left :docWcenter + pointX + "px"}, 200 );
  });

How i can retrieve it?