Slider not moving when page scrolling up

I added following code to functions.php

//we hook the code on the wp_head hook, this way it will be executed before any html rendering.
add_action ( 'wp_head' , 'move_my_slider');
function move_my_slider() {
	//we unhook the slider
	remove_action( '__after_header' , array( TC_slider::$instance , 'tc_slider_display' ));

	//we re-hook the slider. Check the priority here : set to 0 to be the first in the list of different actions hooked to this hook
	add_action( '__header' , array( TC_slider::$instance , 'tc_slider_display' ), 0);
}

Then slider placed top, but on page scrolls up, it is not moving accordingly.
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