var min = 232;
var min2 = min - 50;
var max = 0;

function left_move_init() {
	itm = document.getElementById('left_menu');
	itm.set_pos = function(y){itm.style.top=y;};
	itm.y = min;
	itm.set_pos(itm.y);

	max = document.body.scrollHeight - itm.scrollHeight - min;
	setTimeout('left_move_func()', 10);
}

function left_move_func() {
	tmp = document.body.scrollTop + min;
	itm.y += Math.floor((tmp-itm.y)/10);

	if( itm.y>max ) itm.y = max;
	if( itm.y<min ) itm.y = min;
	itm.set_pos(itm.y);
	setTimeout('left_move_func()', 10);
}

function MovePosition() {
	setTimeout('left_move_init()', 500);
}